Yeah, I get where you're coming from—peace of mind definitely counts for something. Still, I've seen plenty of DIY window jobs that ended up costing way more than expected because folks underestimated the tools and materials needed. It's not just sealant and tape; sometimes it's shims, flashing tape, insulation foam... even renting a scaffold if you're dealing with second-story windows.
Not saying it's never worth it—I mean, if you're handy and patient enough to do it right, you can definitely save some cash. But I've also had to redo installs where people cut corners or didn't realize they needed specialized gear. So yeah, factoring in tool costs might seem nitpicky, but it keeps expectations realistic. Plus, some tools you buy for a one-time job end up collecting dust in the garage anyway (speaking from experience here...).