Yeah, the pressure used is important. Coming from a cartridge razor to a DE razor took me awhile and practice to find the correct pressure. Like you, I nicked and got razor burn until I got the technique down. Now I can easily get nice, comfortable, close shaves every time. Hang in there and don't give up. Go easy on the pressure. Just the weight of the razor head for starters.Welcome
My only other suggestion is to adjust your pressure. You didn’t mention that. I’d go way way lighter on the touch.