NEED help and ideas/options on installing my Derale trans. pan!!!

[CEE1NG_RED]

Hello.
I had swapped my old defective pan for a Derale pan, but I cannot screw the three bolts facing the rear. The bed frame and the cooling ports does not allow me to use my regular/basic tools to screw the bolts. I can't even use a simple wrench either!! Are there joints or some special tools needed that I can use to screw the three bolts from the rear.

Also, what is the torque specs on torquing the screws to the pan, 10#s? 20#s?? I have not tightened the other bolts, just enough where it is snugged so dirt and particles does not enter the pan. Please help, I haven't ran the truck in a few months and I miss cruising in it!!

Here's some pics to help illustrate my situation. Thanks!!