Some guys have all the luck. I've never worked on a cottered crank that didn't end up going to the LBS to get the cotters pressed out.
With Raleigh 3-speeds, it helps to remember that these things are all essentially 1950 bicycles, and intended for the masses -- they had to keep the costs down so the finished bike would be affordable. The upside is they're damned near indestructible. Your LTD is new enough to have the self-adjusting brake levers, too -- they're pretty clever.
Just don't take on any long, steep hills and you'll like it fine.