Also check the backside of your project at the end of each row to make sure you haven’t skipped any loops – it’s easy to fix if you only have to pull out part of one row to do so!
I find it easiest to work with loop yarn if I have a flat surface to work on. If I want to sit on the couch instead of at the table, I just place a picture book or other lightweight flat surface on my lap as I’m working.