Is it easy to replace the iphone battery?

I have an iphone 3gs and I need to replace the battery as its completely had it.
I got a quote from a phone dealer who said to replace the battery is between $70-$150 depending on where I go.
I have seen sellers on ebay selling the iphone battery and tools for about $30.
It is easy to replace yourself or should I probably get it done somewhere?

Its quicker and more reliable to do it with certified people, but you can do it yourself too, just not as quickly and maybe not as efficiently

Yep! But replacing battery yourself it somewhat tricky. Make ensure that you must know full pledged technical details then only you can succeed. Otherwise it seems to be issues.

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