1st: Your supplies: 30 expensive, unenchanted rings. 3 arrows of one kind (i.e. 3 silver arrows), a non-enchanted bow, and 30 common level or better grand soul gems (they all must be the same level).
2nd: Go to an enchant item alter and make an enchanted ring using your expensive ring and soul gem. Use fortify attribute and select your attribute (for a first time, use intelligance). Name it a01. Now repeat 29 more times naming each ring up a number in the sequence (i.e. a02, a03, a04, all the way to a030).
3rd: Now that you have all of your rings ready, equip your bow and 3 arrows. Pull back your bow but DO NOT release it! Now go into your inventory and press A twice while you are selecting arrows. Now, drop a01. Go back and tap A twice on the arrows and drop a02. Repeat up to a030.
4th: Now pick up all of your rings. You should have 3 of each number. Equip a01 and a02. Pull back your bow, tap a twice, same thing. But now, drop the 2 un-equiped a01s (all the a01 ring will go away once you do this). Now tap A again on the arrows and drop a02. Now, equip a03 and a04. Do the same process until you have dropped all the rings you just made.
5th: Now if you look in your attributes section, you will see the attribute you enchanted all of your rings to fortify is HUGE! I do mine with common level grand soul gems and i get up about 250 points for every time I do the glitch.
6th: If you want to do it again, you MUST use a different name. You can use any letter in the alphabet (i.e. b01-b030, c01-c030, etc.)