How To Install a 3.5lb Connector?
 

I just purchased a Glock disassembly tool and a 3.5 lb connector for my G17. Before I jump in to this project, I am curious to learn how difficult it is to make the trigger a 3.5 lb. pull as compared to the 5.5 lb.?

connector change
 

Takes about 5 minutes, tops; but, you really need pictures to go by. It's hard to describe...:)
Here is a link, don't need to do the slide disassembly...and the responsibility is your own...http://www.alpharubicon.com/mrpoyz/glock/

Old-Fashioned,
If your username is accurate, you may like to have printed material to work from rather than a web site. If so, I recommend that you get the Patooma The Complete Glock® Reference Guide.

It's available here: http://www.sportsmansguide.com/cb/cb.asp?a=148260 and probabely elsewhere as well.

I second your recommendation. This is the best book on the market for GLOCK owners to have IMHO! :D