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It's not that tough. You will probably need a razor, as mine fell apart when I did my 1986. I actually had the local vocational school do ALL the weatherstrip on the car for me. I remember that the windshield and hatch weatherstrip disintegrated.
Normally, if I am buying something that I might want a warranty on, I will try to buy locally or from a well known vendor like Wilcox or Mid America. But if I am buying something disposable like this (you're not going to send the weatherstrip back under warranty), I check eBay first.
I purchased door window sweeps for my 1990 just about a month ago. A pair was less than $50. Just buy from a vender with lots of positive feedback.