I jumped onboard with C:47 back in the day and just used to fuckabout mainly. Completed it, but rarely played it optimally.
H2:SA through to *
spit* Absolution, I would move on from a level once I got Silent Assassin rating. Then I'd go back through levels and find alternative assassination methods or fuckabout.
With the WOA trilogy, I turn off all the extraneous stuff (waypoints, mini-map, challenge hints, etc) except Instinct (well, I didn't use it for H2016), and then get SA on every level.
When I went back through, I'd turn everything back on (except waypoints. I think guidance ruins the fun) and complete the challenges on each level before moving on to the next. I'd occasionally pop in to Escalations, Sniper Assassin, ETs and Contracts to keep things fresh. Once I hit Level 20 on everything, I just popped in to fuckabout, just like the old days.
Even if I've never played a Hitman game?
I'd say so. Do what you will, but the tutorial walks you through the typical gameplay loop and how to think about a level pretty well. Guidance does all that thinking for you.
At the end of the day, it's a morbid puzzle game more than anything. A large part of the satisfaction, at least for me, comes from working out ways to whack peeps and then executing it (no pun intended). I usually spend my first couple of runs of a new level exploring and watching the target's route to spot kill opportunities.
It can be pretty overwhelming, so don't be afraid to use the guidance at first; i just think using it for the whole trilogy would mean you miss out on that feeling of satisfaction of having puzzled it out. 🙂