When I went to Siem Reap getting the Visa is not very hard. It just took a while because there were a lot of tourists. Come to think of it, the line in the grocery in my neighborhood is a lot longer. Haha! There really is no hassle. You just have to show your passport, 2x2 picture and fork over $20. You could also get one from the Cambodian embassy in your country, but you have to mail your passport.