Hours days months ? Rushing into something as technically challenging as FPV is not a quick process if sucess is expected. You cant set a time on how long it will take you to master it.
You will be in for a long wait learning to fly properly before progressing to FPV tbh but it will pay off big time
If you paranoid about loosing a plane then forget FPV for now as its an enivitabilty, it can and will happen. Even with RTH
Stick to learning to fly, then flight characteristics first