I'd say yes.
If it's a mechanical, you can probably find 2/3rds of it right there in the Haynes/Clymer, with detailed tech info instantly. With forums, you have to wait for replies and then sift through the arguments between the 'experts' over which is the right/official/best way, before a genuine expert comes along and posts long walls of text with photos to prove it.
Hayneses do occasionally contain small errors, so better than a Haynes is usually a workshop manual and/or an actual video by an experienced professional.
If it's electrical and needs plugging in to a PC with expensive software, you might as well get a trusted pro to do it.