I know many forums that it's not proper to "bump" an old thread, but since Google ended me up here, I thought it best to add the quick answer that would have saved me a half-an-hour....
I have an oven that appeared to be a pain to disassemble. After taking the oven pan off and the spreader tray (both were only a couple of screws), I examined the glow bar/plug and saw the wires went down below the lower pan. The screws for the glow bar/plug were impossible to get to because they were on the underside of the heating element. I knew I needed to get to the other side of the bottom pan.
IF at that moment, I realized, I could just pull the storage drawer out and see that the wires and the heater bar tube all went through the bottom and out into the wide open storage drawer area, I would have saved myself the hassle of undoing a ton of self threading screws and removing all the guts of the bottom of the oven.
If you're like me and your "GE XL44" oven is the same model as mine, do yourself a favor and open the storage drawer below the oven first. :)
In retrospect, at a minimum, you need to remove the two "thumb screws" that also have a slot for a screw driver to remove the oven bottom, and the one hex head screw to release the heating element with the spreader and glow plug/bar still attached. The heating element is just a tube that fits over a nozzle in the storage area. The pan screw that holds the spreader pan to the heating element, can be left on, but it makes handling the heating element much easier if you take it off. If you undo more than one hex screw, you've done too many, at least for my version of the XL44.
The laughable part is this is my SECOND replacement and both times I took off seven hex heads too many. This time I realized "there was a trick that I figured out when I was done with disassembly last time" but only got as far as this post and decided, I just had to bite the bullet and remove all the hex screws. If I had posted these comments several years ago, I wouldn't have done the same thing twice. :p