All trades are not alike in terms of when (or the frequency in which) they conduct their intake. Yes, there are certain periods when, overall, more applicants are being recruited for a variety of jobs and when many or most trades are closed and not accepting new applicants at all, but it varies.
If you are curious about your specific job selections, your best bet is to speak to your MCC/file manager and not listen to your friend. His experience may very well be completely different than what yours will be.
As well, you'll find a lot of info in the Recruiting forum to help you with this and any other questions you might have. Good luck.