I'm on explorer mode, first time playing this type of RPG so bear with me.

I just "completed" the underdark. I did the Myconid questline, and completed the Grymforge only. I'm about to enter the elevator to start Act 2. Can I go back and do the same thing with the Mountain Pass? I JUST hit level 5, so I'm worried I may be a little too underleveled for what Halsin says will be tough.

Did you find it worth it to do both? I'm not particularly interested in Lae'zel's questline, but I hear she's beneficial to take with you.

My main gripe is I'm still figuring out the best composition for my team, and I'm still scraping by on my encounters. I can't say I can solidly enter a battle with no prior knowledge and come out on top (skill issue).