If your fingertips get very sore, stop playing. It is your body telling you, 'Hey, if you keep playing, you are going to get blisters and that is not good.'
Wash your fingers gently in cool water (this will help to stop any infection, plus the cool water will feel good.)
After about 4 - 8 hours, or a nap, etc., you'll find that you can continue playing.
It takes time to build up your fingertips.
BTW, there is one shortcut.......use smaller gauge strings, like Ernie Ball .008's. Yeah, maybe 'real tough' players don't use them, but Eric Clapton, B.B. King, Jimmie Page and a bunch of others do. (Yes, they do change to larger strings for 'heavy lifting.'

Just start with 008's and work your way up to larger sizes.
Jim ntx