Make sure you know where everything is, only get it out if you need it, and check everything is there before you move off.
I like to chuck in a few mars bars as a bit extra. I put my sleeping bag in a bivvie, and do away with the compression sac, it is a lot easier and quicker to use the top part of the bergan as the compression sac and it tends to take up less space this way as it fillls all the little gaps and it tends to stop the annoying rattles. On top of this is my basha.
If you have a good bivvy bag, a basha is very often not needed, I only put it up if it is teeming down to give me shelter when cooking and doing admin, or sentry..... I tend just to use the bivvy when sleeping.
Ther are a few different ways to do it, experiment until you find a way that suits you.