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have you checked the fuses?
you can rent the tool at advanced auto parts (its free they will give u the money back when u bring the tool back) i think u only pay taxes and buy yourself a repair manual for a chevy silverado (it covers tahoes 2 and 4x4) its arround 18 bucks, itll walk you tru it.
diconnect the battery for 10 sec and connect it back, know that the code will come back if u dont take care of it.
well it also depends on how experience you are, but 2 hrs sounds about right.
well hopefully you alredy got it fixed i got the same issue and belive it or not ,sometimes when the cigarrette lighter fuse goes out the obd2 port wont work on the tahoes, 15amp blue. both of the answer above are absolutely correct!