Wind a couple of nuts onto the thread flush with the end of the shaft to protect them and whack them out with a hammer ( so you hit the nuts, not the actual shaft ) I used two nuts, one wasn't really thick enough to hold the threads in place. Once its nearly out you can remove one of the nuts and tap it a bit more, and then remove it altogether and punch it out with a small screwdriver on the end of the shaft to get the last couple of mm
The bearing are held in with a couple of small caps that have been staked in place ( three stakes each IIRC ), you can see where they've been punched in. Anyway, thats what you have to overcome to get the shaft / bearing out. Dont be suprised if the opposite bearing comes out with the shaft, its meant to
I've rebuilt and modified 4 throttle bodies now, bit scary the first time but piece of pee afterwards. Just make sure the threads are well protected as they are pretty easy to damage.
The end caps dont usually have to be re-staked when you fit them back, as they are tight as a mother F anyway
Heres some inspiration for what to do when its all apart