I found that the best way to transition to a plant-based one was to make all of the foods I enjoyed in a plant-based version. Pizza, lasagne, cake, curry, chile, risotto etc. I just searched for recipes online, and did some experimenting on my own to find versions that I enjoyed as much or more than the meat version.
As for the nutrient side of things, you will need to take a B12 supplement, as a couple of other posters have mentioned. B12 is only produced by bacteria, and since we clean and sanitize all of our food now, none of it contains B12 by the time it reaches our plates, without supplelmentation. Farmed animals are fed B12, which is why animal products contain it. A sublingual form (which you spray under your tongue) absorbs better than tablet forms.
Supplementing for vitamin D is also usually a good idea, though this is true for both meat eaters and vegetarians/vegans.
Unless you have a thyroid condition, soy allergy or soy sensitivity, then you do not need to worry about your soy intake. Soy contains phyto-estrogen, not real estrogen, which has no proven ngative effects on the human body unless it is consumed in copious amounts. Dairy, however, does contain actual estrogen, progesterone and bovine growth hormone. So if you’re worried about hormones then I’d worry about dairy.
Tofu is my personal favourite “meat substitute”, though it took me a while to learn how to cook with it properly.
https://cronometer.com/ is a website that allows you to track all of your macro and micronutrients. I’d recommend tracking for a week or two, to get a good idea of what nutrients you are lacking in your diet. Alternatively, there is an app called “Daily Dozen”, which allows you to track the food groups you need to consume each day on a plant-based diet to consume all of the nutrients you need. I used cronometer initially, and it gives a much more detailed picture of your nutrient profile, but daily dozen is much easier to use, so you might prefer it once you are used to a plant-based diet.
The following website offers support, advice, videos, recipes etc. to help people transition to a plant-based diet:
And here are a few of my favourite sites for plant-based recipes:
Best of luck OP! It can be tricky at first, but you’ll get the hang of it pretty fast. Feel free to PM me if you have any questions.