Welcome to the Wikitree! I look forward to meeting some of your profiles into my tree ;). In spite of some of the difficulties you will run into, uploading your GEDCOM file is the easiest way. Check out the link David Selman attached for the new process. I'm not sure this still applies, but when I did it, the system compares every profile you upload to existing profiles, and will show you close matches. You get to say Yay or Nay to whether it's the same person or not. If you have people who are pre-1700s, there's a good chance it won't at them until you ate pre-1700s certified. That applies again for pre-1500s profiles. You have to be specially certified for those profiles. Also, you may discover after they are all uploaded, the relational connections between individuals are broken. You will have to go back through the profiles to reconnect parents with children, spouses, etc. It's inconvenient, and may have been fixed by now, but it will make for a stronger tree in the long run, because it gets you thinking and verifying some of the connections you thought were true, but further research shows may have been missteps in your research. The prices of merging profiles will begin to connect you with other genealogists who may be related to you, or perhaps have control of a special project that may include your family members (Scottish Clans or European Nobility for example). If you have a way of tearing your family GEDCOM into smaller bites, perhaps 500 to 1000 at a time, it might be easier for you to process through and keep a lot of your connections intact.