I try not to color for more than 20 minutes without shaking the stiffness out of my hands! Look after your hands and wrists! Before during and after you color, make sure you stretch your hands and wrists. Keeping your fingers and wrists locked in the coloring position for too long can lead to stiffness in the joints, aches and pain.
If you are new to coloring don't be shy, remember everyone started as a beginner at some point. The coloring community is supportive and you'll soon find that you could be making new friends, picking up tips, learning new techniques and influencing others to crack open their coloring sets!