At the very least...put the truck up for sale and think of every way possible not to drive it to keep the mileage down and increase the value of it.
The best way IMHO is to just start doing it and find out how to handle things as you go along. I know some people just have to go cold turkey, you might be one of those. If so GO FOR IT!
FWIW I have my heavy truck up for sale...so I can buy a Brompton. It hasn't been driven regularly in over 2 years so it is time for it to go.
Aaron