I would imagine if you’ve got a shortened training window then using one of the pre-made plans will make things easier for you.
I found following a plan to ease the learning curve, especially since during that time I am also learning about my own body, strengths/weaknesses, injury, recovery, etc.
I’m only on my 2nd year with the program and have only just begun making some small adjustments to prescribed plans from UA. Mostly related to rest & recovery.
Good luck!