Anal gland cleaning instructions can be found
here... as for how to flip a Flemish, I imagine you'd do it the same way you'd flip any other rabbit - we have a 16 lb cat and I flip him for nail trims as easily as I do my dwarf bunnies. I just flipped him over a couple times (he was not pleased!) so that I could consciously note exactly how I do it... hopefully I can explain it well (reverse everything if you're left-handed, by the way):
~ Place right hand under the center of the bunny's chest
~ Place left hand on her butt and position your left arm so that it's parallel to her back/spine
~ In one swift move (seriously, as quickly as possible - the aim is to catch her off guard), lift her by the chest and scoop her butt under/flip her chest over so that she lands upside down with your left arm beneath her. Minimize the opportunity to kick and range of motion she can kick through if she gets one in by positioning the upper part of your right arm across her feet ASAP (the danger in flipping a bunny is that they can seriously injure themselves if they kick their back legs full-force into open air/through the entire range of motion).
I recommend sitting on her level (ie sit on the floor if she's on the floor, sit on the bed if she's on the bed, etc. - Roo is on our bed right now (which is just a mattress and box springs on the ground - no frame). I picked him up once while standing over the bed and once while sitting on the bed; when I was standing, his feet were free for a split second but when I was sitting cross-legged, I found I could get my arm over his feet the moment they were off the ground.
