Transmission rant, help! Need advice or anything, asap

[ochowdero]

i need help making a decision...

i need my car in about week and a half.

should i just replace the auto tranny with a used one(auto)?
or should i go ahead and do the manual swap? (i really want it manual)
i just dont wanna screw my self over


i have a transmission(w58) at a yard that was in a wreck and can get a oem clutch kit for 120.00
that together is around 420.00 and i have around 520.00

money wise the swap looks feasible.. im just afraid im going to ruin my manual trans, or my car..
and also
im doing this in my garage,
where do i jack up my car at?
where i have it now gives me lil room to work.. and how high?

thanks.. cre i didnt think i needed a M/T wiring harness... also what do i modd on it? or what do you mean by that?