Hedgewytch is appealing and can help but there are still some things that I find totally unaccurate.
For instance, this system tells that 7's are "troubles". Well, sorry but in numerology 7's are not troubles at all and for instance if you have 7h and use the Hedgewytch's system you will say that this is a "love problem" which actually isn't at all the meaning of this card unless bad surrounded, but by themselves 7's are NOT troubles at all. They are dealing with higher thinkings, faith, spiritual things, introspection etc.
So this one about the 7's is quite missleading and could make one be totally off with his readings.
Another example with 8's which according to that system represent "the thoughts of the mind" which a) is not accurate, and b) doesn't tell much. 8's are (mainly) about balance&harmony and making things move and happen. Nothing to do with an intellectual motionless concept of "thoughts".
So, while there are some useful things with that system I wouldn't apply it blindly.