hey ive been looking for new car recently and ive stumbled across this 1987 560 Sel the car's original interior's perfect except for a leak in the sun roof and sides due to some kind of drain that is clogged , there's apparently a high, low beam problem which the seller says he has the pieces for, also one window wont open because of the the mechanism inside the door , car runs and sounds great no leaks in the engine or rust in the bottom, i just wanted to know how much would all of this cost if i did it myself if it can be done yourself, im a complete newbie