I have seen two kinds of people,one who are strict & the other lenient.The first one says,Let anything happen,one should follow what is written in scriptures.The other one says,We should follow the scriptures according to our convenience".
I am confused, which one is correct among them.

Let's take an example of driving rules. If one does not follow strict rules when he drives he will disturb others and himself also. In India cars go from the left side but if he decides to go from the right side what will happen?

Car crash!

It says that if we do one step towards Krishna He will do His 10 steps towards us. As we approach Him He answers with the same. If we serve Him day after day of only on Janmashtami then He also will remember us on those times.

In this way if we really want back home in this life time we will be serious. And to follow 4 regulative principles and chant 16 rounds is not so difficult. Even 10 years old children do in our society. It is not difficult. Just one has to have DESIRE.