If you've never done something like this it will take you ATLEAST 4 hours to do. The MAF, throttle body, fuel rail cover, fuel rail, manifold bracket, manifold, ICV, crank case vent, and misc. vacuum lines will all need to be removed to do this. You WILL need a helper, I did it about 6 times (literally) in 2 weeks because I had lots of stupid little problems when I installed a m50 intake manifold. I'm now a pro at it though!
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Mods: M50 intake manifold, BFP CAI, Fan delete, CDV delete, Clears all around, M contours, Clutch stop, Debaffled exhaust, CF BMW emblems