Last month I had a trans failure in my 91 190 and fixed it myself with the help of Steve B and others around the world. These are doable projects and with some care have excellent results. Take pictures as you dissasemble, a trip to one hour photo or a digital camera can be life saving, Make match marks to help in reassembly. Keep everything clean, wrap parts in newspaper as you dissasemble and rinse in clean atf as you assemble. Rely on your sources. This group, others on the net and your dealer will get you through.
Probably about a million people repair automatic transmissions. Of that 20%have got to be real jerks. Now if two hundred thousand jerks can do this job so can you.