There's no best time or worst time to join forex. So long as you are ready and you have the necessary knowledge. It is better if you are already acquainted with the different topics in forex for you to understand the concept of trading.

See about currency pair, ex : GBP will start from 2 pm so if you trading in above 2 o'clock maybe you will loss.. I thnki like that

Most forex traders are more successful during the late US, Asian or early European trading sessions – essentially 2 PM to 6 AM Eastern Time (New York), which is 7 PM to 11 AM UK time.