yea be sure to bake the areas, after you do if you want to save some time enable surface mesh and the bake options on the top menu bar, if you never seen what it looks like before it may take some getting use to but basically you can see if a place is walkable or not before you go to load a test run
if the area is riddled in a green spider web type design its walkable, if there is a giant gap of nothingness usually also surrounded by a think white boarder then thats not walkable
natural non walkable spaces that are suppose to be there, like from a tileset wall, or a ramp placeable will be outlined in yellow, walkmesh cutters (the blue box you can make areas non walkable with should also have the white boarder after a bake