I think its always better with a rav/hadracha but not all guys are zocheh to that
So if they can’t, as long as there’s a real mekor from a sefer of someone widely accepted (ie mishna brura, the gr”a, etc) hopefully it’s all good growth
its still better to have a mentor to help them decide what to do first etc to not take on too much too fast, but again not everyone is zocheh to that even if they try
would be nice if klal yisrael could set up a system of mentors taking on/seeking out 20 students to be madrich – even so I imagine there would be a deficit…