Most trials are the really tight courses theough woods, over boulders etc. The type here though is a long distance trial that is less about the really athletic riding through streams, up rocks etc, but more general off road lanes, steep but very slippery hills etc. with usually long road sections in-between.
Sometimes you find production car classes as well, so they aren't technically as difficult and hence don't require the same level of balance and delicate touch, but a lot of persistence and hanging on or (or pushing like mad)
regards, Phil