Trailspotting has a superb post for the GPS illiterate like myself:
Your new handheld GPS might seem complex, but in truth it’s very simple to use. This quick article will show you how easy it is to get started, by using the Trailspotting recommended Garmin eTrex Venture HC GPS as an example. In next to no time you’ll be showing off your latest expedition on Google Earth. …
… click through to read the entire article: First Steps with your new GPS – Trailspotting
I’m convinced. It takes 2 AA batteries.
I assume the MapSource Trip & Waypoint Manager software is Windoze only. (I am a Mac guy.)
But posting my hikes to EveryTrail.com looks to be very easy.
besthike.com 
You’re convinced? Then my work here is done 😉
Garmin was working on Mac versions of their software. I haven’t heard about an update in awhile, but I do know it was in the works.
Mac guy also! I knew there was a reason we got along so well! 😉