Two words: Memory Editor
http://www.artmoney.ru/My 'tweaky' character has all skills, with about 200 extra skill points (not yet the divine one, so they sitting around), 150 on all stats with 300 extra points, and level 53.
Really easy with a memory editor.
Start the editor, and search your for your EXP from the stats screen. Hint: Its a 4 byte INT value, so can narrow it down easily.
Go kill a monster and continue searching, within one or two tries should have found it. Then set it to some number like 4 or 5 million. Next kill, you'll jump a few dozen levels.
As you use your skill points, search for them as well. Should be easy to find (same, 4 byte int value). Then you can set them to a few hundred and fill all your skills.
Can also easily lock your HP and MANA so they never go down.
To easy to edit games in memory <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />