[Gimp-user] Is this like Photo Shop?

[Meredith Driscoll <meredithdriscoll mac com>]

Hi. I am new to Gimp and was lead here by friends who use this site. I need to design an invite to mail out 
for a non profit meeting. I have never used Photo Shop and friends mentioned I should try this site, but I am 
clueless as to where to start. I have downloaded an illustrated image from Istock to use in my invite. It is 
a PDF format. 

I hope someone can help guide me through or give some tips.

Thanks so much,

Meredith