is archiCAD easy to learn if you have photoshop skills

I'm a graphic designer working from cape town for overseas clients... they are now asking for 3d modellings of their devellopements. I need to learn archiCAD quickly... I'm no architect and would like to gather comments, and maybe e-mails, from any body out there who knows archiCAD, and the best way to get the software...

are there short courses available, can anyone help me?