Help with ECE adjustable track bar and shock relo kit

[c10noob]

After a couple days work (thanks to multiple trips to the local auto store) I've got the front front end of my 68 c10 lowered with 2.5" spindles and new stock height shocks and coils. Now to start the rear end. I've got a 4" drop setup consisting of coils, shocks, shock relo kit and adjustable track bar. Im hardly a mechanical person so this is a big undertaking for me any pictures for the following questions would be great, now a couple questions....

Whats the best (easiest) way to remove the original shock mounts?

Which direction do the new upper mounts go?

How do I know what length I need the track bar? Is there something I need to measure or once its lowered do I just bolt it on?

Thanks in advance,