1. GET STAPLE GUN, if you have a compressor its a valuable addition to your air tools.
2. the heat is a good tip, the dryer or I usually lay it out in the sun for a little while, it gets nice and plyable.
ok, now your ready...start with the ends, the front end has a little pocket to slide the seat into. then pull it tight and staple the rear along the edge making sure to get the staples into the hard plastic seat pan. after you get the rear done staple the front(don't count on the pocket to hold it forever.)
then start to work on the sides, in the middle first, one side then the other. then just work from the middle on each side towards the endsbeing sure to pull the cover tight for EACH staple...therefore hammering won't work.
this all takes about an hour to do it right. just be patient and don't staple your finger, it sucks.
just pull the cover tightly and pull the wrinkles out as you go. you'll be happy with the results, and be proud that you didn't pay someone to do it.
have fun...MK