You might remember the meaning of the character 惯 with this easy mnemonic:
I'm not accustomed to this weather yet, I need ten (十) lanterns (忄) just to keep me warm at night, and do not (毋) even get me started on all the shells (贝) on the streets.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.