Then build a detached garage, get experience with pouring a slab, attaching walls to a foundation, trusses, more practice with exterior doors and windows, insulation, wiring. If you’re really feeling confident you could put a half bath in it to practice plumbing.
You should be ready for the house at this point. You’ll either love it or hate it so much you’ll just hire someone to do it for you. Having a shed and garage on site is a big plus for building a house since it gives you a warm dry place to work and store your tools. I’ve known people who built their garage first so they could live out of it while building the house, only works if you’re a bachelor though.