How hard is it to change a starter in a 340 Duster?

I’ve been working on my 340 Plymouth Duster for almost a year and I’m pretty sure the only thing stopping me from cranking it is the starter. I will be removing the old one and installing the new one tomorrow and I’m wondering how long it will take and how difficult it will be. I’ve never changed a starter before, but there’s tons of resources online, so I don’t think it’s going to be too hard. I am just worried I’m going to have to take a bunch of stuff off to be able to remove the old one. Thanks!
Check the other post below about starter relay also. No use changing out what may be a good starter when it could be something else. Always check the simple things first.
Tell me more about the problem. Is the battery fully charged? Auto or manual trans? ANy column or wiring mods? Will the starter make a noise at all?
I am a retired USPS mechanic and also have a 73 Dart Sport myself that I am restoring. I'll try and help.