Time is your ally, dont rush. Follow the directions slowly and carefully. Only open the bags when your instructed to do so.
I build all of my cars on an old clean towel, this way if I drop any parts they will not fall or roll off of my work table. This may help you as well.
I would build each step and take a break. Example - build the diff's, take a breather, build the shocks eat some lunch, assemble a few parts, see whats on the t.v.
What I am getting at is take your time. If you jump in head first and do everything in one shot, you will get fustrated and it will not be enjoyable.
Last of all TAKE YOUR TIME ON THE SHOCKS. They are easy but if you dont pay attention they wont work correctly. Put all of the pieces on the included tool in the order of the directions, put extra oil on the seals as per the directions, just use extra. Place the tool on the table and the shock body over the tool and lightly but firmly press down untill you hear and feel the "pop". Thats when there seated correctly. Remember when putting the shocks together the oil is your friend, use it. If not you will tear the seals and they will leak.
Do not over tighten any thing, remember your putting metal screws into plastic.
It is ok to trim the front tire foams to get them to fit properly.
Take pride in your work and your build.
Thats about it on my end.
Dont forget to have a good time.