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Installation isn't tough. Disconnect the fuel line(s). Remove the linkage. Unscrew the TBI. Put the electical stuff back on (IAC and TPS depending on which one you are doing).Replace the gasket. Screw the new one back on. Attach the linkage and fuel line.
Are you talking about just the throttle body or the whole set up with intake & all?
I rebuilt my throttle bodies and installed new injectors myself. I never did one before and it was pretty easy. Mostly o-ring replacements. Alot of people are afraid of these things, but I think they are easier than carbs. Good luck.