Changing fonts

Hi Forum!

Let's say I have a document where I have used for example Arial Black and Times New Roman different places in the document.

Then I want to change all the Arial Black to Futura Bold and Times New Roman to Calibri Normal without tp pick out the text that need to be changed, but can replace one kind of font with another in the whole document at once. Still keeping their size.

Can that be done in an easy way?

Thanks in advance.

Jesper Kragh

Denmark