Hey Sai,
The difficult part is removing the 6 small screws by which the chrome mount is fixed to the lens barrel. In some lenses the are 'glued' to the mount by accumulated dirt or screwed in to firmly to remove by regular consumer screwdrivers. Your local watch or jewelery seller probably has more professional material to unscrew them (regular cheap screwdrivers can mess up the screws easier than you would think).
A good tip is to take pictures of each step (just for yourself and for an interesting thread on this forum
)!
The only tricky part in dissembling the mount of a A-lens is the spring that drives the diaphragm driving plate (circular shaped piece of metal). It's a good idea to remove the actual chrome mount very slowly, and try to look between the half remove mount and the rest of the lens, while keeping the diaphragm flange in its place and look at the position of the spring, the copper contacts and the little boomerang shaped piece of metal that works like a contact switch between the A-setting and the manual F-stops.
Maybe have a try with a cheap A50/2 or so?
You are always welcome to come over to Belgium and let me do the fiddling
Good luck!
Frederik