On how hard a job the starter is ...
Nice new (to me) resource there,
wpoll, thanks.
But having had my own starter in my 3.0i out and in recently, I went and looked up the corresponding description from that source:
https://www.newtis.info/tisv2/a/en/e...unting/FT7KzqD
And I'll say it is practically useless for this job. Very misleading if used to estimate effort. For mine, it is almost an absolute necessity to remove the intake manifold to gain access to it from above. Access from below is impossible with the transmission and engine block in place.
For me, I had the intake manifold and a ton of other stuff already off. And even then, getting those Torx E12 bolts from the back side is tough. And it was not so hard for me, but I had read of people with corrosion problems having real difficulty getting the starter free of the dowel pin there, even after the bolts are removed.
I'd bet closer to a full day than to 30 minutes. Sorry.
As far as what useful instructions would look like, the obvious stuff is to remove the nuts holding the wires in place, remove the bolts holding the starter in place, and swap. Yes, easy, obvious, and useless all at the same time.
Good instructions would tell you what optimal set of steps you need to take to get access to all this, based on what tools, expertise, other stuff going on, etc. ... which may be different for every car (e.g., 3.0i vs. 3.0d for starters ... ahem) and situation. Your mechanic might know this. If he will be removing the intake manifold to get access, maybe it is a good time for some pre-emptive repairs on some of the stuff in there. CCV?
Good luck.