Some people have a gift or talent for languages and speaking, others find it more difficult. If you can tune your ears in to what is being demonstrated, you will find it easy. If you are ‘deaf’ to the subtle features being compared, then you will find it more difficult.
Furthermore, people who practice consistently every day and adapt according to the feedback received, will find they fare better than those who don’t practice.
Thirdly, people who create frequent opportunities to chat to native English speakers will find it easier than people who seldom speak to native English speakers.