Having an incline of any sort makes skating MUCH more difficult. Level parking lots, playground surfaces, outdoor basketball courts, etc. are all good candidates.
Most inlines have the wheels set in a straight line with no rocker. These will not feel similar to ice skates at all. PIC skates have the wheels set along a curve, mimicking the rocker of an ice skate. To just stroke around, they feel amazingly similar. Three turns are a little different, but very doable.
I've done spins on mine, but the feeling is very different from ice. They require a different technique to do.
And falls are much more unpleasant on pavement. Most of my PIC skating was done on a smooth wooden floor in a roller rink, but I skated on some parking lots and bike trails once in a while. Harder, outdoor wheels should be used if you plan to do much skating outdoors to prevent excessive wheel wear.
EDIT: There have been other threads about PIC skates on this forum in the past. I recall some of them got fairly detailed. Don't forget to try a search for additional threads about PIC skates or other rockered inline brands like Snow White, etc.