From a Czechoslovakian perspective, it wasn't entirely that difficult. Most of the smaller villages and towns only had a few Nazi guards, and generally they relied on local police forces that were working for them to help weed out suspected resistors. Living in the bigger cities (like Prague for instance) was a different story. In areas that had more of a Nazi presence, you were more likely to be required to have random searches, seizures, etc. Also, most big business's, industries, etc. had all of their workers searched and cleared. For the most part, the Protectorate of Bohemia and Moravia got off quite well in terms of the percentage of their population displaced/killed.

If you are at all interested in this type of information, I would strongly suggest reading "Prague in Black: Nazi Rule and Czech Nationalism" by Chad Bryant. It's a little slow in some parts, but the stories about resistance, how the Nazi's treated an occupied territory, and the national response are fascinating. Hope this helps a little bit.

Source: BA in History, Concentration in Czech Studies