all I do ia hang em till almost bone dry, just before the buds are crumbly, then I trim em, then I bag em, thats it, thats all, done. as long as its dry, mold worries go out the window, and as for opening the bags every now and then, not necessary.
Ive kept ganja in my crisper for 6-8 months with no problems, & it still tasts the same as the day I bagged it.