I have done quite a few, typically decent grade units made in China. Once you do one, it will all seem pretty simple. I typically did all of the work with a battery screw gun, and a bottle of carpenter's glue. Good luck, and don't forget a whole kitchen's worth of flat packs is a heavy load, it's not coming home in the back of the car.
Hanging uppers can suck. Take a long level and put a pencil line around the room, where the uppers go. Use a stud finder and find the studs. Predrill at least two screw holes into ever cabinet, four if the layout works. Have the helper hold the cabinet to the line and put a screw in. There are moments when the whole deal will go as smoothly as a monkey fucking a football, but you will prevail in the end. Good luck.