Good idea.
I find that doing mosaics is very absorbing, time flies, and it is like a meditation session.
Mind you, the pain hits a day or two later, but I take the view that if I'm going to be sore, I won't mind so much if I have something to show for it.
So the pleasure is worth the pain.
I would suggest that before you start anything, spend a good bit of time with the design and colours. Putting the piece together is easy, but getting the design right is where the work is. I am very fortunate to have an artistic daughter, at home, who guides me on this, and lets me know when it is not right.
Enjoy.