Yeah. And of course your feet would need to be locked underneath something
. If your gym doesn't have one there are some ideas we just discussed in Sentinel's journal. Go look at that and there is a link to a thread with some ideas and a picture, etc.
Good tips from Riddick and I hope that all this helps.
Just getting the deadlifts up with good form in itself will help. On the parallel squatting I imagine this will be a big problem with a whole lot of people when switching to lower squats in general and A2G in particular. This is why people advice at least going a little below parallel. The thing is you hips (meaning all the associated muscles, hips, hams, etc) don't come into play as much until you go at least a little below parallel. And what little bit they do come in they will tend to play second fiddle to the stronger quads which tend to be dominant for most people to start with.
When you start the glute ham raises you will probably not be able to bring yourself up without using your hands to push off. What most people do is try to use there hands just the minimum necessary but then accentuate the negative. I would say just have a nice controlled negative, kinda slow. But don't do anything super slow at first, even if you can because you will end up paying a price for overdoing it. But the slowing down the neg in itself will go a long ways towared building stregth and you should soon be able to do reps unassisted. I would also say to build on them slowly with only 1 or 2 sets not to absolute failure and add to that if and when it seems tolerable and doesn't affect you progression on squats and/or deads.