No need to build your yoga practice from scratch.
Your job is to COLLECT stuff that works.
A yoga class is simply your laboratory to test the techniques being taught.
Your practice is built when you collect what has resonated.
The harder task is, of course, to discard what DOESN'T work.
The more good techniques you collect, the more you can figure out what to use on your own.
This personal curation of stuff that WORKS is what makes your yoga practice yours.