Sounds like TDII worked in prepress for a large format printer for 20 years, printing wraps for buses and trains sold across Canada.
I observed the wrap process for a transport truck and trailer for a drag racing car belonging to one of our managers.
We hired pro installers who used small plastic squeegees that they actually licked to lubricate the vinyl which I considered to be an unhealthy practice.
In large format print there are three factors, in ascending order of cost; the printing, the installation and the cost of renting the space.
Installing on your own vehicle you only need to cover the print and installation. We printed on 50" wide 3M self adhesive including perforated see-through substrate, specially made to be removable. Toronto Transit streetcars and buses are changed very often so must be easily removed & installed so they have full time employees trained to do that.
All of our wraps were laminated to protect the ink from weather and fading. I think 3M is guaranteed for one year against colours fading.
Longevity depends on the amount of sun.
There are self adhesives, like "Busmark", that will rip the paint off of a car when attempting to remove so you need to make sure your printer is using the correct substrate.
Your printer may be able to get an existing template for your exact vehicle from 3M. (Building a new bus or streetcar template was always a time consuming job).
Once you have paid for a quality product it would be a shame to mess up the installation so I would get a quote from an experienced installer.
If installing yourself ask your printer for some offcuts to try to practice with.
Cars are just tools to me. I couldn't imagine being embarrassed to be seen using a scuffed up wrench or drill, so I'm not embarrassed to be seen driving crusty, ancient vehicles. Anyway, the driver's not quite yet ancient, but is definitely crusty too.