It may sound like a beginner's question but I've been playing guitar for more than 25 years now. But recently, I had to take an eight-month break from playing partly because of COVID related travel restrictions. I never had such a long break before. Anyway, after finally rejoining my guitars yesterday, I played for a couple of hours and I was pleasantly surprised that, after a short warmup, my playing was alright. But now, as expected, I got blisters and pain on my fingertips.
What's the correct way to rebuild those callouses? Should I ignore the pain and keep playing? I know joint pain is potentially dangerous and shouldn't be ignored but I have none of that. Or should I rest for a couple of days until my fingers recover a little?
Also, out of curiosity, would the answer be different if I was a complete beginner?