Most important lesson: Stop and smell the proverbial roses, take a metric ton of photos and savor every moment of the hunt, even the pack out through the thick nasty.
Second lesson: Decide if you need to punch your tag in order for the hunt to be a success. Some folks are fine with eating a tag on a premium hunt. Others are not.
Guided makes sense for some hunts. No knowledge of the unit, too far to scout, insufficient time to scout, etc.
DIY with some close friends makes sense for some hunts. They may know the local landowners, historical patterns of the game, know the unit like the back of their hand, proven lethal on consistently killing the target species no matter where they are at.
Personally did guided on a premium elk hunt and that money spent was well worth it. Made new friends, learned a lot, and got a book bull. Not a premium tag but did the same on a black bear; that was money well spent after years of being a day late and a dollar short.
Seen the DIY route. Friend had a desert bighorn tag in a top unit and everyone came to help. In theory it's good but it was way too many people to coordinate and he did not enjoy the hunt nearly as much as he should have. Had two close friends with previous experience help with an on-base oryx hunt; time with them was the real trophy. Helped on a friend's family member ibex hunt. The ibex did exactly what he said they would do.