YOU SAID:

I'm writing this with a hand in a blanket

INTO JAPANESE

私はこれを毛布に手で書いています

BACK INTO ENGLISH

I am writing this by hand on a blanket

INTO JAPANESE

私は毛布の上にこれを手書きで書いています

BACK INTO ENGLISH

I am writing this by hand on the blanket

INTO JAPANESE

私はこれを毛布の上に手書きで書いています

BACK INTO ENGLISH

I am writing this by hand on the blanket