Yes, it's a pretty simple job.

First, get a pair of channel locks / slip joint pliers. I like the Knipex style, and think that's a great tool to have in a small toolbox. e.g. https://www.harborfreight.com/hand-tools/pliers/single-pliers/adjustable/12-in-fast-adjust-water-pump-pliers-56749.html You want to to be firm with them while not crushing them, and make sure you're turning the right way. But generally they aren't difficult. And those parts are cheap to replace, worst case.

Second, someone has already messed those up. Those fittings do not need teflon tape, but there it is. Those make a flared seal with a gasket. It's either 1 1/4" or 1 1/2". Example: https://www.homedepot.com/p/OATEY-1-1-2-in-Sink-Drain-Pipe-Plastic-Slip-Joint-Nut-with-Rubber-Reducing-Washers-HDC2698C/316622089 Chances are fair that the gasket is missing. If you have a bit of water under the sink from time to time, getting a gasket in there will fix that.

Have a good basin to put under all that for the stuff that will pour out. It's important to get one that fits reasonably well with high enough sides, or it's easy to make a mess.