Just don't heat the pipe tips. When you heat acrylic, it will change the diameter of the pipe, and depending on the actual material itself, this will cause it to either expand slightly or contract. If done on pipe ends, you'll either get pipe that is loose on the fitting, or so tight it gets to be a royal pain to get the fitting on.
Heat acrylic slowly and evenly, don't allow the heatgun to concentrate in any one area or you'll burn the pipe, turning it a permanent shade of brown, and over size any heating to prevent kinks. Heat before and after a bend, not just at the bend.
I bend EMT and PVC on a daily basis, and gotta say, the PVC is more forgiving and requires less actual skill, but more patience.