You don't need to press your fingerprints, you just need the signature of the testator.

According to the law, a self-written will is a form of will written by an individual himself. In most jurisdictions, self-written wills usually only need the testator's personal signature to take effect, without fingerprints. Signature is an important way to confirm the testator's true will, which has legal effect and can prove the authenticity and integrity of the will. Handprints are not mandatory, only the testator's signature is needed to ensure the validity of the will.