Saving pepper seeds.

[KarenO]

I would like to know the best way to isolate pepper blooms to prevent cross pollination and be certain of true seed.
Large Distance between varieties is not really an option for me, I have bagged tomato blooms but never peppers. Anybody have some pics of their bagged blooms I can draw inspiration from I would appreciate seeing them. Or do you cover the whole plant, I have yards of tulle so that's a possibility also.