Seems like you already have a good idea on things you are interested in trying. I am a similar age and started HRT 2 years ago so I was in a similar situation, and I have a few specific recommendations.
When it comes to Hair Removal I bought a cheap at home IPL device. It has removed most of my facial hair, but IPL and Laser Hair Removal do no work on white hairs. I have a few white beard hairs that I am going to have removed with electrolysis.
For nails as others have said you can start with a clear nail polish to practice and to wear. In my experience most men don’t really notice a clear coat and women have been supportive. If you are going to do your own nail polish you may want a nourishing nail polish remover since 100% acetone can make your nails soft.
For wigs you can get cheap wigs on aliexpress or similar direct from china stores. The synthetic wigs are cheap and you can modify them without worrying about ruining an expensive wig. The synthetic wigs do not look as good, but you can use them to get a feel for what type of hair style you may want. If you do want to modify or style the wig a good pair of hair cutting scissors will help. I have followed youtube tutorials from brad mondo with some success.
I have some male pattern baldness (androgenic alopecia) using minoxidil (generic rogain) has helped. If you have recent hair loss minoxidil can help.
For makeup I have found the brand E.L.F Cosmetics to be good for makeup that is on the cheaper end. I have used E.L.F products to practice and learn makeup without spending a lot of money.
For clothing as others have said thrift shops can be a good way to try out new styles. A style guide that I often see linked is Triangle Body Shape I have wider shoulders so certain styles don’t look the best on me. This guide can give you an idea of styles you might want to try that can be more flattering if you also have wide shoulders.
I’m so happy you found a solution that works for you!
I also prefer injections now that I found a method that works for me. I started with sublingual then moved to estradiol cypionate 5mg/ml in cottonseed oil in 5ml vials. With injections I found that part of the problem was that I was prescribed 18G needles to draw and 23G needles to inject. With the 18G needles I was coring vials and with the 23G needles they hurt more than they needed to and left little red dots at the injection site that would last for months. I switched to 23G for drawing and 25G for injecting. The gauge of the needle made a huge difference for me. With the 23g needles I no longer core vials, but it does take longer to draw. The 25G needles are painless now. With the 23G I had to use a bandage where I injected, but now with 25G it can be hard to tell where the injection site was.
If I can obtain it I would like to switch to estradiol enanthate in MCT oil at 40mg/ml. The carrier oil is less thick which makes it easier to draw and inject. The much higher concentration means you have less volume to inject. I plan to use even smaller 30G insulin needles for drawing and injecting.