Depends on your pride level.
Disassociation means you left them. Disfellowshipping means they kicked you out. Both means they announce you out at the next Service Meeting.
I've known those that during their Judicial Meeting they went out in a Blaze Of Glory giving those elders a earfull after earfull of their sins and being proud of that or giving them a well researched talk of WTS errors which they cannot disprove making those elders speechless.
Others simply left and never looked back.
I took the third alternative - I dropped out. And it's been so long they haven't given me a Shepherding Call for years.