PT3 has a 60-days free trial, so get it immediately imo.

PT3 allows you to find leaks while they are still 'fresh' and not consolidated into bad habits.
Also, no matter how good you are at taking notes. You can't possibly note what every player does in every hand, so you'd probably label a 35 VPIP and a 50 VPIP under the same category.

Get it now imo. When the trial is over, you can get the micro-version and eventually upgrade it to the full version in the future.