Tips for subbing in wheelchair?

I'm having a surgery soon and will be non weight bearing for a while. I have a wheelchair I'll be using to get around. Any tips for substituting in a wheelchair? I worry because I've seen quite a few classrooms not set up to accommodate a wheelchair. Wheelchair lifts that are being used as storage spaces. Old buildings that aren't accessible. Any tips so I can work? Do I need to let the school know ahead of time?