Transitioning from Wheelchair to Walking with a Walker

How long did it take before you felt safe walking by yourself with a walker after being mostly in a wheelchair for weeks or months?
My physical therapist has given me the go-ahead to start walking (as long as I'm wearing my knee brace) unaccompanied by one of my home healthcare aides by my side, but I don't feel 100% confident, yet, to go walking-around inside the house completely by myself. Still doing exercises and trying to get my strength back after stroke 4 1/2 months ago. Doing better, but what do I have to do in order to feel more confident? Should I just "go for it" or take it a little more slowly until I feel safer?