How much effort the kit is to install and setup depends on how fast you want your car to go, and how reliable you want it to be!
If you're handy with a spanner then I don't see any reason why you wouldn't be able to have it bolted in within a weekend...
If you're not handy with a spanner, but a quick learner, gather around some knowledgable mates and do it over 2 weekends...
Keep in mind you need an oil return fitting welded/glued/stuck into your sump .. which is the hardest part of the whole thing. Apparently you can also tap a return into the timing cover, which would make the install significantly easier.
Once it's all fitted up, you're a set of injectors and a TUNE away from having a beast of a car.
the auto will actually make the car quicker than a manual in a striaght line, provided you get it built suitably.