I just installed a set of Moroso 2 3/4" studs on my car. I pulled the axles and used the hydraulic press at work. The axles must come out, so you might as well re-pack the wheel bearings and swap out the axle seals. The means draining the rear so don't forget the sure grip additive and gear oil. I bought a nice hand pump at Auto Zone that screws onto the bottle and makes filling the rear a breeze. Also make sure you use anti-seize on the wheel studs & lug nuts. As for the actual selection of what to buy, most catalogs walk you through the choices.