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Is it worth it?? How hard is it to do, or do you have to take it to a shop?
Yes, its worth it if you do not like the nose down look.
Easy to do, took me about 2 - 2.5 hours total.
As for taking it to a shop that depends on the kit you purchase. Most all of them you can do yourself but with the Daystar you'll need the spring compressor tool to disassemble the strut tower. With the autospring you'll need no special tools. And after all leveling kits you'll need an alignment of the toe.
Do a search on this site, there's a wealth of info on this topic.