The air tube to throttle body and the coolant overflow tank are parts you can install yourself with very basic hand tools. They are also right on top, so there is nothing difficult to installing them yourself. I think all you will need to install the air tube is a 10MM wrench (a 10MM rachet wrench will make the job go quicker, but any 10MM wrench should do) and if it's like my 94, there are no tools required to install the overflow tank.
The sway bar ends links require an allen wrench and also require you to raise the car and support it safely. You will have to remove the tires/wheels to get to them. All in all, IMHO this too is not a difficult job for the average DIY'r. If you are comfortable with this, give it a try yourself. If not, let the mechanic install them.
Definitely install the first 2 items yourself to save more money.
Mike