Maybe 20-30 minute

job to pull it out. Same to put it back.
Pull it out from the top, but you'll need to get under the car to access one bolt in the starter.
Being RHD, there's not a lot in the way, just slightly awkward to get at. Once you figure out where stuff is, you'll do some of it by feel.
Starter has one bolt through the bellhousing from the rear, one goes through the starter from the front.
You'll need a socket set with some long extensions. 17mm, 3/8 drive with a long extension and flex joint to get the one bolt at the rear.
17mm for the one in the front too.
12mm ( maybe 14mm) ratchet box wrench for the wiring.