The mishnah (Megillah 1:4) tells us:
אֵין בֵּין אַדָּר הָרִאשׁוֹן לַאֲדָר הַשֵּׁנִי אֶלָּא קְרִיאַת הַמְּגִלָּה וּמַתָּנוֹת לָאֶבְיוֹנִים
There is no difference between the Adar I and Adar II except for the reading of the megillah and gifts to the poor.
I've tried and failed many times to make my Adars the same, but I make mistakes. E.g., I can never remember what I had for dinner on 4 Adar I by the time 4 Adar II comes around, and it's hard to remember to get up at 6am on 20 Adar I because I have to catch a flight on 20 Adar II. Sometimes I'm even in different cities or working at different jobs. Once, I was even a month older come Adar II.
What are some suggestions people have to keep my Adars in line and keep this important mitzvah? (I'd accept sourced answers or people's own experiences.)