No.
Alcor must wait for an independent authority to declare that illness or injury has caused the heart to stop, that further medical care is not appropriate, and that therefore legal death has occurred. Only after that determination is made can the cryopreservation procedures legally begin.
Some states within the US and some countries have Death with Dignity laws. These arrangements must be made with your medical provider within their detailed criteria and requirements. Alcor will work with you if you choose to make this decision for yourself. Alcor members have utilized death with dignity and were successfully cryopreserved after legal death.