I don't find it significantly more difficult than any other frame. Is it the top grommet piece having a separate headguard creating problems for most people?
After the first time, each installation has been a breeze. I've probably replaced 15 sets in the APD/PD and PS (which also has a separate headguard).
Once you get the side grommets installed, leave the last few nibs out of their grommet holes. Then starting on one side, start the headguard by completing the side grommets which also penetrate headguard. Work around to the other side with the top grommets through the headguard fisnishing on the other side with the side grommets through the headguard. The last step is getting the overlap correct where the top grommets meet the side grommets (which can be completed by using an awl).
Also, when pulling the original grommets, use string cutters to remove the flared part of the grommets.