The series can be done in any order, but is numbered from the recommended (free) parking area (coordinates given in SWAT1). There are other caches in the vicinity which you may want to consider finding if you haven’t already done so.
The route takes you mainly along footpaths (some could be muddy in winter) but there are a couple of short stretches of road where care should be taken with young children and/or dogs.
Don’t forget to take note of the Bonus Letter and value in each cache. These will be required to calculate the coordinates for the Bonus cache, SWAT14