If had help, and a couple extra tools (suction cups, paddle to cut out old window, electric caulk gun thing they use to apply sealant, etc) it would have went a lot better. I got it done, but it did suck, for days. That sealant is hard to get off skin. Once I found out I wasn't saving any money, I call my guy. He installed my last window while I was out of town, and billed me via text. He takes Paypal, I never even saw him.