Well sport that is the easy side. It should just about darn near fall back into place. If it does not you need to make sure the the splines are engaged properly in the transmission and when they are just give it a tap on the far end with a rubber mallet. Now if it is not engaged you will screw up the shaft and the gears inside the box. Also, when you go to tap it you need to make sure that the axle joints are compressed all the way so it will transmit the force of your blow. With any luck you are just hung up on the circlip on the end of the shaft that goes into the trans. If it does not engage the gears like it should then you need to pull it out and compare it to the old one, if it looks the same then try and refit the old one and see how that goes. All the while be very careful that you do not booger up the seal that it goes through on the trans. If you have not done one before it is probably just a case of inexperience and you don't have the experience doing many of these that would allow you to say "hey I need the BFH right here". What ever the reason it shows good thinking on your part, I have seen far too many trainnies and rookies destroy stuff because they did not have the presence of mind to say, "maybe I should ask someone before I screw this thing up"

Mark