Yeah, I bought the Indomitus box a couple of years ago (when I had a job lol) because I love Necrons and my partner likes the Space Marines (so original haha). I painted two necrons and never did the rest of the squad haha! I have a bunch of D&D models to paint as well.
When we bought the box at Games Workshop in the CBD, the clerks helped us with painting tips. We also have been to PAX a number of times where you can minis as an activity too. We are by no means great painters, but they do come out quite servicable haha!
I would love to see a pic of the predator tank you painted! I'll find the first mini i ever painted too haha it was quite horrid 😂