Some things I have learned in my six months of being a cut throat shaver which will ensure a good cut, and possible scarring.
1) Treat a new razor like an old friend. All razors are individuals with their own quirks. This goes triply true if it has a spike or dreadnought point.
2) Forget to strop.
3) Become distracted. Whilst the question of whether Megan Fox's jubbly wubblies are real or bolt ons deserves serious consideration, the time to ponder that question is not when you're waving a cut throat around your face.
4) Let the mirror fog up.
5) Try to rush the task. If you are that short of time pull out the old Mach 3 from where you stashed it last.
6) Forget that your ears stick out from your face. I'm surprised I still have earlobes.
7) Forget that the cutting edge is 3-4" long when you are using the heel of the blade to shave a section of your face. Especially if you are using a spike.
8) Be indecisive about where you are going to place the razor. I'll put it here, no there ... pass me the styptic.
General rule: Razors are thirsty little buggers who want to drink you blood and will do so given a tenth of a chance.