Judging by the number of 'casas' on the Goon Squad Forum, they ain't always the best place to leave your car.
Btw, what car are we talking about here?
1. Radiator cap - depends on how rotten your cap is. You can just buy one with the same specs at SM Hardware if you're not really particular about going OEM. OEM is available at the casa. I have yet to meet anyone who does not know how to replace a radiator cap (Procedure: remove old cap, put on new cap

)
2. Lower engine support - why do they want to replace this? Are you feeling excess vibrations, is the part physically damaged? Try to look at it first. These are the 'feet' of your engine. This is where the engine is physically attached to the car body/chassis.
3. Crank oil seal - unless it's spewing oil in your face, I'd probably hold replacement of this part until it comes time to do the timing belt change para isang labor na lang.
4. Driveshaft oil seal - again, if its not spewing oil or losing oil at an alarming rate, I'd just wait for a bigger service then isasabay ko na lang.
5. Battery terminal - why do they want to replace it? This is another part that's available even at the mall and is pretty easy to install.
HTH.