Dave
I say go for it. I have always done my own automatics and find they are not as mysterious as people think. Important is clean clean clean. do use lint free cloths during reassembly. do get yourself a 1/4" torque wrench, as it is very important to correctly torque the valve body. did I mention clean is important. one grain of sand or one hunk of lint can hang up the sliding valves in your valve body. I can usually completely rebuild in one day. I used to pull rebuild and reinstall in 8 hours, but that was 20 years ago. I try to think in terms of small groups of parts. this will help uncomplicate things. I don't know about a BW tranny. carefully check the placement of the check balls. There is nothing one man can build that cannot be repaired by another man. Have fun