1970 340 swinger headliner installation question

I'll be installing mine after the car is painted. The car is stripped so I don't see it being more than a few hours to install the headliner itself. I've done one before so that helps. However, the work to strip it down and reassemble, glass, reinstall trim, visors, etc. is not inconsiderable. I'm sure they would be charging for a full day at least if they want the glass out. I don't think it has to come out but it would be a pia to do it glass in. That said removing the window trim, glass and reinstalling is a bit of work too. You might then need new gaskets and trim clips too.