Marc,

FYI - the iBeam is actually pretty easy as a self-installed mod. The only thing you might worry about is installing the end-pin jack. If you have some handiness with a drill, you likely already have a good pilot hole with the strap button on your Yammy.

Take the button off, cover the hole with painter's masking tape (the blue or green kind) select the size drill recommended by LR-Baggs, and have a go. I know, it sounds scary somewhat, but there are plenty of resources online to help show you how to do this.

Here's Dan Erlewine's excellent instructions: http://www.stewmac.com/tsarchive/ts0010.html

But there are more and don't require the specialized tools he mentions.

-Scott

Also, don't be fooled by the 'aftermarket' aspect of adding a pickup. For most 'electro-acoustics' they are nothing more than an already existing acoustic with the pickup and electronics added after the fact. What normally results is an overpriced crummier guitar, with an overpriced pickup system installed. I learned this lesson the hard way.