I'm a newbie too, but I learning how to use GIMP.
It's not that difficult as you imagine. You can do what Picasa can do but with more flexibility, and you can also do many more things.
Just take it easy, look for tutorials online, and focus on each aspect / technique at a time.
This site has a lot of resources that will help you.
And as important (or more) than reading tutorials EXPERIMENT!
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