Experience, experience, experience and a will to spend some time banging your head on the desk is what is required to do such a swap of working tools...
After going through Oracle, SQL server and Sybase I think that is just a question of a few months missing it. After that is a piece of cake!
Having a tough job teaches you a lot!! All good!
Congratuilations with your new job, perseverance pays back!!
Can be applied to programming languages, once you understand what it is important to learn first you will be ok!!
Next step then is CLR C# ? ;P