Honestly, once you get the valve cover bolts out, I recommend replacing them with regular bolts. I did the ARP kit, but I think any should work. Went back in to the valve covers this weekend, and it was night and day vs the stock allens. Every one came out without worrying about stripping out.
When you get to the return lines, I found cutting the tab that connect the two parts of the crush washer allows the top part to spin, and the return line bolts come out WAY easier.
Good luck!