What happens if you try to debug yourself ? I mean, does the process crash ? If it is possible, how would you implement it ?
I have tried launching x64dbg and I can't attach to my own x64dbg process.
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Usually it’s not possible because one process must control the other and most debugging commands (e.g. reading or writing registers) need the target process to be stopped.
A common approach is run a copy of itself as a separate process (can be done on Unix systems using fork()) and debug that. In theory you could implement a custom debug-like functionality using signal or exception handlers or low level APIs but this is definitely something that would require a lot of work and unlikely to be very robust.