I have to agree with Brian that it is not a good material if you are just starting. First because of its excellent properties it can cause some pretty bad habits because it is so forgiving. More importantly its tuff stuff and because of the narrow forging range needs to be forged quickly.
Forging H13 especially in the 3/4 to 7/8 range for hand tools is really power hammer work. I use this material for nearly all hot tools in my shop. It is important to soften the striking side of the tool as previously discussed.
I find that I prefer the S1 - S5 and S7 steels for cold cutting tools or edge tools that I use in the fly press etc.
This is a great material to use. Its consistent, has great durability but it has a learning curve and you need to be very careful not to heat up past critical tempature.