Purchasing O365 directly direct with Microsoft, despite O365 email through Go daddy

I'm currently looking to move everything over to Business O365 - I currently use it for one organisation and now wish to use it for personal business.  

I have Go Daddy website and purchased email through them, from Microsoft, with a couple months left on that contract.  I want to go all in on business premium but noticed when I signed up for the month free trial, using the email address, then I have to use the Go daddy admin platform (which defeats the purpose as I don't want to go through them, but use Microsoft dashboard directly) - and it would not let me use the free trial elements.

What's the best way forward?  Is it a case of cancelling email and signing up with O365 once that's complete? I don't want downtime on email address for the business.

Any advice?