Can I replace this bathtub drain?

Looks like it. Lowe's makes a tool that goes in the drain and you unscrew it.

Get a dumbell tub wrench and hope either the tub if its cast iron or the drain isnt rusted. If that is a fiberglass tub you should be able to for sure get it out.You could buy it and return it if you fear you are going to break it.

But I have to get a new drain in too. That's the other half of the equation.

Yes, it is manageable to do this yourself...I did one of mine a few years back. It was kind of a pain in the arse, but worth it because I saved a couple of hundred bucks.

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It's a P-trap below it. You can just replace the top drain for aesthetics without messing with the actual P trap below.

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I guess my question is if I have to tear the shite out of it to get the old one off, the new one isn't going to just slip right in, the new one will have to get all jacked up just to wrench it into place?

Educate me.

It screws in. Try cleaning the female threads after you get the old one out. If you're lucky, the new one will just screw in. If not, you're gonna have to get under the tub and replace the fitting it screws into. If you have a valve access panel, that would be a good place to look for what you'd need to replace

Ever heard of YouTube? Plenty of videos on this. I just replaced mine in the house I just bought because the old one’s top was broken. The drains themselves simply screw into the pipe under the tub.

You take that tool I referred to up a few posts. Jam it into the old drain, then grab your 1/2 inch drive ratchet and unscrew the old drain from the pipe.

Clean the threads in the pipe and around where the old drain was. There will/should be dried Plummer’s putty all in there.

Next take your new drain. Some new drains come with a threaded adapter if you have a wider pipe inlet. If you don’t need the adapter discard it.

Take some new Plummer’s putty. Just a ball of it about the size of a ping pong ball and roll it between your palms and create a snake. Take that and wrap it under the new drains lip and lightly press it in place to form a seal.

Take the tool used to remove the old drain. Carefully put it in the new drain (you don’t want to scuff it up) then place the new drain into place and start to hand thread being careful not to cross thread. When you can’t hand tighten any longer put your ratchet back on the tool that ms jammed in the new drain and click your ratchet to tighten and start to screw it in. Screw it until the Plummer’s putty starts to squeeze out from under the drain lip and the tub and you feel you have tightened it enough. Do not over tighten. Take your finger and remove the excess putty that squeezed out. All done.