Part of it, too, depends on how large your Ancestry.com gedcom would be. If it would include over 5000 individuals, then you would not be able to upload the file to WikiTree and there is no way on Ancestry.com to make the file smaller--it's either all or nothing. If your Ancestry.com file is larger than 5000 you will need a program which can help you segment your gedcom into smaller files. I do not use a gedcom to create profiles, but I've been told by others who do that even though WikiTree allows the upload of gedcoms of 5000, the optimum size for the GEDCompare process and profile creation is a file containing about 500 individuals.