When reading through your message, I thought of a couple of small, sanity-tips I wish I knew back when I started. I'll pass these along just in case they might be useful for you. Please feel free to take them with a grain of salt, of course—this isn't a "you must do this post", but rather a "if a certain thing is driving you crazy, you're not alone!" post.
Rebecca wrote:In fact, I have started loading vocabulary into Anki already from my text books. Although time consuming, I can see that if I am consistent in reviewing material this could be an incredible tool for my language learning.
Anki can be both amazingly useful and actually quite a lot of fun. But if you have perfectionist tendencies, it can also turn into a torture machine. There are two good tips to minimize the risk of Anki turning sour:
- If a card pops up and you groan, delete it ruthlessly. If all your cards make you groan and you end up deleting your entire deck, then feel free to ask the forum for alternative ways to use Anki.
- For the first month, try to limit yourself to no more than 10 new cards a day. Everybody is tempted to bump it up to 30 or 40 after a few days, but what happens is that eventually the reviews start piling up, and you find yourself reviewing 5× or even 10x that number of cards every day. Learning 10 new cards and reviewing 50 old ones is fine. Learning 40 new cards and reviewing 200 old ones can be terrifying. Anki does not automatically adjust to changing energy levels, so it's better to start slowly and adjust things after a month or so.
Rebecca wrote:As for speaking practice with my partner, unfortunately my speaking ability is so limited at present that I can barely put two words together, let alone have a rudimentary conversation. Hopefully that will change very soon, and I intend to make speaking a priority as soon as possible. We have been reading out loud together from the first couple of Assimil dialogues, as well as Beginner's French Reader, by Anne Topping, and a couple of FrenchPod101 podcast transcripts, though. I recognise that I have hit the language learner's equivalent of the jackpot in terms of having a native speaker at my beck and call to practice with, and I intend to make the most of it!
Some people like speaking early, and some like waiting until they understand more. Both groups get good results, so it's probably safe to go with whatever feels right for you.
I do speak French with my wife, but it wasn't easy to make the transition. Until I reached A2/B1, we pretty much drove each other crazy whenever we tried to speak French. And when I finally started speaking in French full-time, we ran into another problem: It seems as if when you meet a person, there's a little switch in your brain that says, "This person speaks language X." This switch gets set very quickly, and it can be surprisingly hard to change. For several months, we had to make a constant effort to remain in French. But eventually, we somehow managed to get our "switches" stuck in the opposite direction, and now speaking English to each other actually requires a conscious effort. Brains are weird.
I think your idea of reading Assimil dialogs together is absolutely wonderful. But if you hit any snags talking to your fiancé in French, it's not the end of the world—not all couples find it easy to switch languages early on (or even at very high levels). However, that doesn't mean that there aren't huge benefits to having a native speaker as a partner. For example, they won't complain about the amount of time you spend studying the language, and they won't complain if you hog the TV for watching French series and movies!
I know it's early days, but I am rather enjoying the process so far. Ask me again in another couple of months and it may be a different story. 
- and I did know some French when we met, but I was barely at an advanced beginner/low intermediate level, so interacting with my in-laws was a challenge, especially when everyone was talking at once. Once the wedding date was set, I really focused on improving, and my husband and mother-in-law were huge helps. I love to read, so found easy French novels, and asked a ton of questions on how to pronounce and define unfamiliar words. And one piece of advice: decide what level of correction you're comfortable with. My brother-in-law would correct every single mistake I made, which ended up being more discouraging than anything else. My MIL, on the other hand, would let me finish my thought, then chose one thing to focus on, whether it was an error in noun gender (LE and LA still are problems for me!), or the correct verb tense to use, or a pronunciation mistake. I learned so much from her, because she was patient and let me talk, and figure things out as I went, and answered any question I had.