It's hard to quit unless you REALLY want to. You must make that decision when you are ready for it and then stick to it. Go for a coffee with whoever? Try taking decaf instead.
The sugary drinks will probably be quite hard to do without if you drink that much of them. Try either cold turkey or reduce your intake by two cans a day for the first week. The next by another two per day. A gradual decreasing of intake could be more for you if you normally have a massive quantity as you'll be more likely (perhaps) to relapse with it.
Don't deprive yourself at first, but ask yourself when you drink these drinks when during the day you could avoid having one. Then go from there.
Good luck, the first and hardest part is admitting that you have an addiction.
The sugary drinks will probably be quite hard to do without if you drink that much of them. Try either cold turkey or reduce your intake by two cans a day for the first week. The next by another two per day. A gradual decreasing of intake could be more for you if you normally have a massive quantity as you'll be more likely (perhaps) to relapse with it.
Don't deprive yourself at first, but ask yourself when you drink these drinks when during the day you could avoid having one. Then go from there.
Good luck, the first and hardest part is admitting that you have an addiction.