It sounds like you are going about things the right way. A lot of doctors, however, do not support plant-based living, so just be aware of any bias on their part. Luckily I have a wonderful open minded doctor.
I've had all my blood work done as well. I wanted to see where I was at when I started, so I could compare results later on down the road. I also wanted to check my thyroid, blood sugar, etc, before making such a huge diet change.
As far as dairy goes...from everything I've read and heard about dairy, you are far better off throwing that stuff out anyways. It's not only addictive, but it is counterproductive to bone health...not to mention the carcinogen in casein protein.
For me, personally, going without all those animal products I used to consume was the easy part for me. The hardest part for me was learning to cook new foods that taste good. I was so used to many things being really fast and convenient. Vegan food can be just as fast and convenient. I'm still learning, myself, how to make it that way though. I am getting better. It has taken a bit of time though.
I believ your fiance is supportive, but is concerned for your health. I am wondering if perhaps it is out of a lack of education on the subject. Perhaps sit down and watch Fork Over Knives with him. It's not like a plant-based diet falls deficient on nutrition. Well, it can, but I think only if you're either really really picky, and selectively only eat certain things, or if you just don't educate yourself on how to live this way.
Just take your time with this transition. I've heard of people throwing everything out in one go, and making the transition overnight, basically. I think some people just have to do it that way. I personally made my transition rather quickly, but there are no rules set in stone. Go at your own pace, and stay determined and motivated.