ya, pinning isn't a big deal at all. It can actually go even smoother with a smaller needle. A 22g is fine to draw with, but i would actually suggest pinning with a 25g. It slows down the injection because the oil won't move through the needle as fast, but a slow injection is what you want and there will be minimal pip to where you can barely even tell you injected at the site
and is 25g good for test c?