Are you talking from the hinges or from studs?

>>2982942
are you good at 'making stuff'?

it's very easy, problem is code obligations. exterior entrances are often required to be done by licenses professionals. in florida we have a handyman exemption
but really you just remove old door, get measurement, remove trim around frame
get new door, install, may require shims and foam. will require routing the door at hinge spots, kits for this are like 20$. also for the lock systems
install trim

>>2982942
if you know what youre doing its no biggie. Worst case scenario is the replacement door is the minimum standard size allowed by code (gay) and your current door is smaller than that, meaning you have to expand the opening, replacing the header and pushing your jack & king studs out. 2 competent men should be able to handle the bulk of that work in 2 days. If the new door is smaller than the current opening, you're just packing shit out which is noting.

Is the front door wall load bearing?

It's an exterior wall. Next question.

>>2982942
regulations are political not practical, odds are you aren't allowed to do it even if you could and thats why they can charge so much.

installing the door? not even worth mentioning, easy peasy. replacing the frame and installing the door *properly*? not gonna happen. you basically need all the skills to replace the entire wall yourself in addition to putting the door in. not impossible, i could do it, but definitely not easy even for a pro. even without the difference in size aligning and mounting a door properly by yourself is difficult.

>>2982942
Ah. Yeah I deal with this.
My home was built in 1952, and has decades of "improvement".
I have openings that are shit like '23&5/8" ', and similar.
Go to a proper hardware store, and tell them what you have. they'll usually help you out.

I could do it, but you're probably not ready kiddo. Let the pros handle this and pay your taxes.