just done this myself and what a t!"£t of a job. it will feel stiff for a bit you should have done the linkage bit by bit but hey were here to learn!!!

as for the gear change get somebody to sit in the car and position the gear lever between third and forth gear in neutral and tighten the shift up under the car this will work but you be very lucky to get it right first time!

good luck matey and may the force be with you!