Suspension help

[Straight six]

Well I'm getting ready to install my 4.5/6 drop kit for my 78 c15 lwb Heavy half. Also I'm rebuilding both front and rear suspension as well. Couple question I have are when installing my control arms do I keep all shims on the uppers? Are there any special tips I need when tackling the front end? And the rear when replacing old leaf springs with my new ones will they just fit right in place no special tools? And can ANY parts that I'm removing potentially fly out and whack me in the head front springs or rear leafs?? Here is a pic of some of the parts. And almost forgot do I need another pair of jack stands to hold the rear end up when removing and installing leafs or just use the jack and balance it?