Geocaching.com defines 1 star Difficulty as "Easy to find or solve within a few minutes" and 4.5 star Terrain as "Extremely demanding movement over potentially hazardous terrain."
You are looking for a field box, if you are at the posted coordinates you are standing above it, if that's not clear check the hint. Please take care to replace as found, don't leave it dangling!
Cache within your abilities and happy caching!