You can do both in your garage with a buddies help. Dont let someone else do it. You will be proud of your self when you get it installed and hear that thing bark 2nd.
Well you will have to pull the tranny out (or at least back) from the engine to install the converter. You may as well go ahead and pull the tranny out from under the car, this will make the shift kit installation go a little eaiser. However you can put the shift kit in with the tranny still bolted to the engine.
Converter change: Remove dust cover. Remove 3 converter bolts. Remove drive shaft. Remove the 6 bolts holding the tranny to the engine. put a jack under the pan and take the pressure off the tranny with it. remove cooler lines, shifter linkage, and your kick down cable. then remove your crossmember that supports the rear of the transmission. slid tranny back away from engine so you can get to the converter. Turn an pull on converter and it will pull right out. When you install new one put 1 or 2 qts of fluid in it. (Lube the nose of it with tranny fluid) Then twist and slide it on. BE SURE IT IS ALL THE WAY IN! It should go about to "clicks" before it is in place. Then install in reverse order.
Shift kit: IF you are fairly mechanically inclined the shift kit will be no trouble. The instruction (detailed) will come with the kit you buy. IT is fairly simple. Just involves removing pan, valve body and seperator plate. Some kits have stiffer springs for the valves in the valve body. All will have new seperator plate and gaskets. Probably about a 3 hr job if you have never done it.
Any more questions and I will be glad to try and help