he's right^, just go for it, but you dont have to blast into it first time. come in with more speed than you think you need the first time though, you definitely cut more speed going up the wall than you think. just keep hitting it and adding more speed each time as you get comfortable on it
also just a note- i sort of feel more comfortable hitting a wallride as if i'm lipsliding it.. first time i hit a big legit wall ride (loon's orange one) those were the two things i learned, bring more speed than i think i need in, and hit it from the left first cause it felt more natural to me for some reason