Thank you all so, so much for the helpful information guys!
So, after reading the first link posted on here, watching the vid and reading this post
http://www.rwgforum.net/topic/132392-eta-keyless-tutorial/?p=987221&hl=sneed12&fromsearch=1#entry987221
I felt confident attempting the fix myself.
Got as far as taking off the rotor and thought to myself, 'Right, this is it, you have committed' - Went on to unscrew the next step but my screw drivers are very cheap and I could not get a good purchase on the screw to loosen it - I then thoughy, nah, I dont wanna mess anything else up.
Flipped the movement over and decided to try and take the datewheel off - same thing happend.
I think in this instance, I will take it to the watch maker to see what the cost will be - esp as I want the h4 set up to allow more clearance over the stick markers.
But, what I 100% know will do is buy a cheaper movement and have a tinker around - I really do fancy attempting this and see a new obsession forming.
Time for me to look into some better tools.
Thanks again
Dave