Looks good mate, certainly does enhance the look of the car, well woth the effort!
Just need to tint the glass now :cool3:
The vinyl will shrink but all vinyls shrink due to the way they are made, its the quality of the material that determines how quickly. With what you used there it will be years down the line really until you see paintwork, depending on how close your cuts were to the edges.
Just wash the vinyl same as the rest of the car and put a coat of wax on it as you do the car to keep it as glossy as poss, just dont use a compound like t-cut on it as that will dull it quickly! Use a polish not an abrasive.