There's no shortcut if that's what you're asking. Just keep trying until you succed.
You get it when you go into the Sacred Grove.(the first time)
The Temple of Time, the entrance of which is in the sacred grove.
The Sacred Grove
It is at the beginning of the sixth dungeon the Temple of Time. well yes it is there but you go there later in the game so you go to the sacred grove
the first is on death mountain. there are 5 others on upper zora's river, lake hylia, the sacred grove entrance, snowpeak trail and in the hidden village.
The ancient wood. The Temple of Time is in the Sacred Grove.
go to the woods near the forest temple to go to the secret grove........ again
You get it after defeating the darknut in the temple of time in sacred grove. (6th dungeon)
U get the other snail when you go through the time door and it is in the exact place the other one was but it is 100 year ago
the first is on death mountain. there are 5 others on upper zora's river, lake hylia, the sacred grove entrance, snowpeak trail and in the hidden village.
you get it straight away then go snow peak then farons secret grove then the hevens with the cannon you find in kariokoi after you find all symnbols and find secret village
The entire Realm is the Sacred Grove!