Talk to your neighbours. Tell them what to expect, let them know it won't be late, or long hours. I'd imagine your bass will be the hardest one for them to cope with - at least with the piano they'll hear a bit of a tune. So do anything you can do to keep your volume down as much as possible (headphones, unplugged), and tell them that you are doing this. You are allowed to make some noise, and as long as you are being considerate they really shouldn't mind.