1. technically, you're supposed to replace everything in pairs, I wouldn't worry about just doing one tie rod though
2. I think you would need the press to install the inner tie rod end, but chances are good you only need to do the outer tie rod end. looks like the link you have only lists complete assemblies though. according to realoem the part# for the right outer tie rod is 32111139314
here's how to tell if it's an inner or outer tie rod end, jack the car up and make absolutely sure it's secure, use jack stands, don't rely on the floor jack!
then stick your head underneath the car while someone else shakes the wheel side to side and watch the tie rod.
if you see play in the ball joint at the outside end of the tie rod, it's the outer.
if you see play on the inside end of the tie rod, it's the inner and I believe that's the one you need a press to install.
hope that helps, let me know if you need anymore info
