I started specialising in the Indian States at an early age, back around the early '60s. I
knew then that it was going to be rather quixotic trying to find Indian States stamps here in a very parochial Melbourne.
I fairly early cleaned out the stocks of interesting material held by the few local dealers who had anything at all for sale. Then it was on to haunting auctions, and corresponding, by
airmail, with dealers and collectors overseas. Two to four weeks to send off an enquiry - and get back the usual reply that, 'Sorry we don't have one in stock at the moment'.
One learnt patience.
I don't particularly enjoy the shopping around part of specialisation, but it's a price worth paying. The upside is the chance of making finds, and of making a serious contribution to knowledge ... even if the contribution
is only of interest to half a dozen other people around the world

To my mind, collecting all world just seems rather directionless and short on challenge. Again, to my mind, the real interest
starts where the catalogues end, and it grows greater the further you get from the catalogue listing, until you're in really unexplored territory.