Only read if you want to know depressing bits about using Dignitas please.
I'm disabled and used to be a member as did my friend.
If you're serious, please do your homework. It's not as simple as you may think, unless you're a Swiss resident. It's very expensive and fraught with problems for others accompanying you including around disposal of the body. (Pre-agree cremation to make simpler)
We have a rose tinted view of Dignitas here, that doesn't match the reality. Not their fault particularly, It's more controversial there than is publicized, so they have issues with premises, and sometimes struggle getting services such as body collection etc.
Current set up is on an industrial estate though they've tried to make it pretty, but quiet it isn't.
You can't just make an appointment and turn up, so most foreigners are advised to end their lives before they need to, to ensure success.
Many don't realize all it is, is a very expensive way of committing suicide on camera, by drinking (very bitter) barbiturates unassisted and unattended. Assuming procedure unchanged, it has to be done early morning for efficiency in reporting your suicide to police, so funeral directors can collect the body, and Dignitas can provide evidence that it was planned suicide not spur of the moment.
Anyone accompanying you needs to be ready to be detained or arrested on return here. (Swiss authorities notify ours) Though the nature of Dignitas having been used, means they are unlikely to face more than being initially put through procedures such as searches, swabs, cell etc, prior to questioning and release, but traumatic for some especially if grieving and not expecting it.
Not quite the peaceful scenario most think about, either for the person dying or those accompanying.
I'm not seeking to put anyone off using them, just suggesting those who are serious, really do their homework so they understand what they need to be able to do, when, over what time frame, that it can be quite rushed, what can happen to others, and exactly how much money they need to have.
All of which is just to effectively achieve social respectability in making a choice to commit suicide.
Cheaper, more comfortable ways of achieving the same results do exist.