How to get free shipping on certain products?

[OttoBohn]

Hello,

 

What I'm after is trying to get free shipping across the board whenever a certain product is bought. Most of our customers will not know how to use the coupon system properly. To eliminate the extra step, I was trying to find a way to tag a product for free shipping whether by tax class or extra product field. I would like to know how to modify free shipping module to turn on or off if there is a product in the cart the is due for free shipping. I've spent hours searching and trying to figure this out and will need help.

Please let me know what you think.

 

I do have extra product fields installed..could i setup free shipping this way? please advise me

 

Otto