With All One's Might
With All Your Might
noun
You put one cup of liquid... no, one full cup of liquid spirit into what you're doing. None of this half-cup garbage. A full one. That means you're going at it with all one's might.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Will help if you've seen 一杯 before.
今は古い写真を捨てることが私にできる精一杯です。
Getting rid of old pictures is the best I can do for now.