Magic 3.1 doesn't have CLK wire, so no, you don't have to twist them.
As for tips, you can search the threads for soldering tips. The hardest part with a v7 are the bios pins. Make absolutely sure you don't bridge those legs.
A fine tip soldering iron will help you out a lot. If yours isn't fine tip, try using a file to sharpen it a bit. I use long metal tweezers to hold my wire in place while I solder the wires to the bios legs. Prevents my fingers from getting burned and is great for holding the wire steady on a bios leg.
PS2 v7 Messiah 2
Pioneer DVR-105 fw v1.30 2x4all