I've been shaving my head and my balls with safety razors for like 15 years. Get some nice soap like sandalwood, cedar, lavender, frankincense, sasquatch or whatever name they're calling it these days and make a lather on your body in the shower. A lather from actual soap is critical to avoiding nicks, cuts, and especially razor burn. Use a new blade and gently drag the razor across your skin. Use short strokes, not long passes. Clean the razor. Add more lather when needed. Don't press hard or move the razor sideways or diagonally. That's how you cut yourself. Watch out and take care for any bumps and rounded corners, like warts, the back of your jaw, or any sagittal crest you may have. Hold the razor with one hand and use the other to feel for hair and smoothness. Make a pass with the grain and another against the grain. Reapply lather between passes.

Maybe before you begin, shave a little hair off your arm or leg to test the angle you hold the razor. The sensation of individual hairs being cut will be tactile and satisfying. When it's right, it'll feel right.

Get a sharps container for used blades. It'll take a lifetime to fill. Blades only cost like a dime, so just treat yourself and use a new one every time.

It ain't too difficult. Just be gentle, take short and slow strokes, feel your way around, and don't shave dry skin. You may be surprised how easy it is. They're called safety razors for a reason.

Its a matter of practice. Just know that as long as you only move the razor in a straight line and dont wobble it side to side, you cant fuck up too bad. You want to learn to hold the razor such that it is always meeting the surface of your skin at a 45 degree angle, use very short strokes, and use your other hand to pull your skin taught.

You also want to remember that, especially when starting out, you dont have to do a great job on the first or even second pass. Do the best you can, and if there is still hair, just re-apply shaving cream and go over those spots again. Eventually you get good enough you can get everything in a single pass most of the time.

There are some good videos on youtube where people have tutorials on learning to use one. Also because it cuts closer to the skin, you may want to invest in a face moisturizer in addition to an aftershave. Really helps to prevent ingrown hairs and makes your face feel amazing after shaving with one. For pubes/longer hair, I would shave with an electric shaver first to shorten the hairs, and then follow up with the razor.

For those more sensitive areas you want to make sure you're getting a razor body where the blade doesn't protrude as far. Henson shavers are incredible quality but I dont remember if they have a razor body suited for body hair.

The idea with these razors is to not apply much pressure, just letting the weight of the razor itself do the pressing. As long as youre doing that, and not holding it at a stupid angle, you should find it quite difficult to hurt yourself shaving your head. Same goes for your pubes, but if you're going to shave your balls with it you'll need to take a lot of care.

It's like anything, you get used to it after some practice. Definitely not as daunting as you think.

You can either start with one of the milder razors sold by Edwin Jagger, Muhle or Merkur and pair with a moderate blade such as the Gillette Silver Blue OR get a good adjustable razor such as the Merkur Progress or Merkur Future and again pair with a moderate blade. Do not start with Feather blades.

I've been shaving with a DE razor for about 15 years now, and I haven't found it any easier or harder to cut yourself with them than the modern "Mach 84 Spike TV Edition" cartridge razors.

I've been getting the razors from Aldi's for when I (rarely) clean shave. Can't tell the difference from the "fancy" brands