We already had a Trust with our house and other assets. When we first purchased our timeshare I did not think to title that into our trust. After doing some research online and speaking with our attorney i decided it made sense to move ours into the trust in an effort to avoid probate. We own at Kings Land in Hawaii, and plan to add at least one other HGVC unit in the future. I did not want to deal with probate or estate rules in multiple states, so the trust solves that.
As for the process i called HGVC to ask about that, and they referred me to Chicago Title which was their partner at the time. At one point there was a blurb on the website about doing this, but i am not sure if that is still on the new site.
Using the HGVC partner made it pretty easy, but I can't honestly say it would have been much harder if i went with someone else that was less costly. I don't recall how much we paid them for that, but i know they have raised the prices since we did ours. They actually raised the price in the middle of my transaction and called to let me know, but then said they would honor the old price. I let them know i thought it was very generous of them to honor their contract...
