As other mention you have plenty of time to experiment and learn Xert before your 120-day phased progression is started by setting a TED (target event date).
See this article for details –
Training Right For Your Event – Xert (baronbiosys.com)
Lots of newbie tips posted here – Beginner questions
Academy series videos are the quickest way to get up to speed – Discover + Improve + Perform
FAQs here – Support Home – Xert
Welcome aboard. 