I trim things with an electric trimmer, but to actually shave I use a double edged razor. Some people are scared of them, and even a lot of the people who use them on their face are scared to shave their pubes with them. It’s really not that hard though. I also don’t see why you’d want more blades (which I think every disposable is like 5+), because that means if you fuck up and move your blade sideways your cut will be that many times worse.
The key thing, and this applies to all methods, is you have to keep the skin taut. You have to pull the skin that is being shaved, not just drag a blade across the loose skin. If you don’t, you’ll likely cut yourself. Along with applying to all blades, this applies to all skin also.