Follow and Assist setup?

Can someone help with a follow and assist setup for 2 toons?
I have G510 and want to setup the second toon to follow and assist with the "G" keys, thanks! I have set something up but doesn't work well so I would like some advice.

[Ualaa]

viewtopic.php?f=6&t=2247

This is an adaption of MiRai's video guide for Follow/Assist from any window.
The post is in the Everquest forum, but the video itself is going to be useful for pretty much any game.

I'd start there.