Increase this by playing the game or completing Paramedic side missions. Health is obviously the most important aspect of myth hunting, especially when many myths found are aggressive.After you have unlocked the countryside, you need to build up your stats. I am a skilled GTA player and may be biased, but if you play hard enough you can get to this mission with about 2-3 hours of playing the game.
To unlock The Countryside (the area on the west of the map) you must complete the story mission The Green Sabre. Shooting cardboard caricatures transitions well to extraterrestrials.Before you even begin myth hunting, you need to make substantial progress within the game.