The clues to the values of i, m, n and o are to be found in the geochecker on the page of the accompanying cache GC19XTW.
The cache is hidden at: N 51 14.o(m-1)o; W 000 16.(m-2)(i-n)(i+1)
Terrain: good shoes recommended and maybe gloves, even though I placed it in work shoes with bare hands.
No climbing needed; just a short scramble.