If you are considering importing your Ancestry.com tree into your Legacy file so that your source records that you have linked will appear in your Legacy file, I have some advice for you. Don't do it! Instead, manually enter the sources from Ancestry.com into your Legacy file. At least then, instead of tedious, non-researching merge time, you can actually be researching while doing this.
It is going well I guess. But it has been mind-numbing and tedious. Very mind-numbing and tedious!
It is all my own fault. I realize this, I really do. Had I entered the full birth dates, Legacy would have auto-merged much more of the duplicates. Had I stuck to one location standard, Legacy auto-merge would have auto-merged even more. I'm not even seeing an Auto-merge option at TMG. This frightens me, because it means that if I finally cave and split my file into 6 pieces to import to TMG I would have to manually merge!!! all the duplicates from the overlaps. I say six pieces because so far I have had success with importing 150,000 people at a time to TMG, my total file contains currently 885, 496 individuals (with 1, 375, 291 source citations if you care.) I can probably make it a few thousand smaller if I ferret out all the merges that didn't get done.
What I need to do now is go literally person by person through my entire file and improve what I know on each person. Ideally, I would do this once I get the data over to TMG, but that is taking too long. The best plan I have thought of so far is to divide up the database into parts, a New England part, a New Netherlands part, a French Canadian/Acadian part, a nobility/royalty part. That is only 4 sections though, and not necessarily even sized sections. Then take note of the number of individuals, import the 4 parts to TMG, and merge until I have the same number of individuals.
Another option is I continue to use Legacy, and publish the data to the web in sections like I described above. The downside to this option is there would be no "recently updated" option, and I would have to manually fix all the ID #s in Second Site each time I regenerated the webpages. Despite this, this is probably what I will do for now, until I figure out a better plan!
I have a strong desire to actually research today! So, I am going to research all the people born this day today. While doing that I will hopefully improve the locations and find some more merges to do....