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Joe D.I purchase many cards here on the BST or eBay that I am not too familiar with / and maybe am not sure I would want to keep... but I buy them to look at them and see how much I like them. So testing it out with one card sounds like a good idea to me.
For the only set I have - I purchased my first card at a show... and was immediately hooked.
After that - at any opportunity to pick up a card from the set - I jumped at it.
The hunt is fun.
As far as one set at a time... or multiple sets....
at all times - every item in my collection has a certain rank. So even if I am going after more than one set at a time... I may give up on lower 'ranked' ones to help complete the higher ranked one.