[Any] Another Tough one. (Involves lots of variables)

I want a way to make a Blacksmithing/Fishing system with levels. This is pretty much what I was thinking.

Variables:

• Blacksmithing Level
• Blacksmithing Exp
• Chance to Catch

Switches:

• Blacksmithing Learned
• Blacksmithing Level

Ok, so i would make an event that would, in theory, Let you craft/catch certain things depending on the variable Blacksmithing Level. The variable Blacksmithing level would be set by another event that would take your exp (gained everytime you do a quest/craft/catch an item.) And find out weather or not its a certain number or less.
For example:
90 or more? (no) ok, then
80 or more? (no) ok, then
70 or more? (yes) ok, then your level 22 in Blacksmithing
Set Variable "Blacksmithing Level" to 22
Text: Congrats! Your level 22 in Blacksmithing! You can now create Custom Armor!

and then, when you go up to an anvil.

Blacksmithing Level? 22 then you can make:
Blah.

all i really need help with is the event that will declare the Blacksmithing level. I'm not sure how to do that. I know there are some great eventers on this forum. So feel free to speculate easier/better ways to do this.
(i do want to have the level system though)