Hellooo and thank you! :)
I use a Wacom Bamboo Fun, the tiniest version. Sometimes I have trouble blending values; I’m only just learning how to paint in PS. I used to have lots of trouble blending, which is why I hardly picked up my tablet. There are 2 ways I blend; one is when I simply use the Smudge tool, but with the Shape Dynamics and Scattering set on (this ensures that the colours don’t just move around; it’s like using the Add Water blend option in SAI), as my base colours. Then I go over with brushstrokes, using the Eye Dropper tool to pick up the values I’ve smudged together. Otherwise, I just paint with a hard round brush to get general values, then blend them together using a middle-ground colour, with a medium-soft brush on a pretty low opacity. Helps to get a good gradient. :)
For my greyscale work, I tend to work on 2 layers: one layer is pure medium grey, and the second is what I actually paint on. I haven’t done much colour work, but the layers go all over the place when I do - shadows and highlights go on different layers set to Overlay and Soft Light etc, whatever works best.