How to follow strict rules of Jainism ?

Jainism is as strict as you perceive it to be. Religion is of course very personal. Jain Acharyas say that you have to practice the religion yatha-shakti (as per your capacity) and according to the desh-kal (place & time). One can interpret this to mean that Jainism allows you to walk the path of gradual progression provided your heart is pure and conscious is clear.