Yes, I always have complete control of my workspace. I refuse to work in meeting rooms, for example, where the chairs are unsuitable for extended working, and I always carry round with me a spare monitor, full size keyboard and my own personal task lighting.I also carry with me a small toolkit - spanners, screwdrivers, drill, saw - and find clients are more than happy for me to spend a few hours customising their furniture at the start of the project. Try it!