i was one the warwick bass 101 thing and there was a bit for slapping triplets. Where you pop the g and d strings one after the other and then slap the e string. I was doing some popping and it was starting to hurt because there was no calluses there. Is there a way to build up calluses quickly?
Play with your fingers a lot. I guess you could like, rub them on sand paper, or on an edge of something. But playing fingerstyle will build them in all the right places...
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Once upon a time, someone posted something like, "you can build callouse by repeatly punching a bowl of sand, straight out of the ninja handbook", probably poorly quoted, but I follow the concept religiously.
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Try using a lighter touch. I had a problem with index finger joint pain from popping strings. For about a year I had to use the middle finger exclusively. Now I can use them both again, but keep them very relaxed. Might help prevent blisters too.