It is harder and shittier than you think it is, even if you think it is hard and shitty to begin with.
Use more stripping gel than you think necessary. Buy more stripping gel than you think you will need. Leave it on longer than you think you should.
Work in smaller areas than you think you should - it's better to have a smaller area completed and still have some energy left than to not be able to finish the area you planned to because it's late, you're tired, hungry, and damn sick of this project.
Put huge tarps over everything.
Fall asleep thinking about how awesome it is going to be when you're done with this whole shitty project.
Buy more "after wash" (aka, turpentine) than you think is necessary.
If possible, live 11 blocks away from the downtown Manhattan Home Depot.
(Guess what I've been doing? Since Saturday? Did I spend 3 hours scraping today? Did I wake up at 7am and put the THIRD ROUND of gel on the window frame I'm trying to strip? Did I rush home at 5 and start scrapping it off? Did I stop at 9 to go to dinner - and hurry to clean up in time for that? Will I have to do at least 6 more sessions? BLEAH.)