Will disposable razors do the job and approximately how long will one last if used every morning? I wouldn't use one--I use Personna M5 (difficult to buy now) or Fusion, and a fresh blade. But first clipper everything off at the shortest setting on he clipper--then take a nice shower, shampoo & condition the stubble, leaving the conditioner on when you get out.
Do I shave against or with the grain? With the grain for the first shot, you'll get into against the grain soon.
Do I have to apply shaving cream/gel every time I shave or will water work? Yes, apply it, it's just like shaving your face.
Do I have to apply aftershave? Not necessarily, but an astringent and then a shaving balm will help.
How hard is shaving for an absolute beginner? Just take it slow, then it's like getting to Carnegie Hall, practice, practice, practice.
Is there something I should apply before I go out? Sunscreen!
And the question I've always wondered..... - do bald people use shampoo? Yes, if they want to, and I do, from the leftover from the beard.