Whoops! I didn't see there were more replies
Thanks for the answers everyone!
I'm too terrified to use my own finger to test the water temp right now. It took me a year and a half before I felt confident in gauging the temperature of my daughter's bath water without Mr. Bath Duck Thermometer's help, lol.
It's good to know 1 degree isn't a big deal. I also took the added step of using a reverse siphon to add the new water back in the tank. I figured that it was a more gentle way of doing it (no fish freak out) and that any temperature fluctuations would be gradual and not all at once.
So far I've got two changes under my belt. I'm less scared, too. Hopefully it'll get quicker and easier the more I do it :)