Adam,
Not necessarily harder, but more complicated due to existing constraints. Irrigation pipe and heads, wire and subsurface drainage must be tied into or worked around, not to mention tying the new contours into the existing terrain in a seemless fashion. Proper planning is required to move the necessary materials and machinery around on site with the least disruption to the non-renovated turf areas. Further, depending on the scale on the work being done, staging the work so as to minimally disrupt the daily routine of the membership.
TK