This is not a C25
I lowered and raised a mast on an O'Day 23 with some friends, however a C30 is a new ball game. I paid my yard close to $800 to remove and reinstall my mast last year, and it was worth every penny. Allow me to explain further. I was not present when the mast was lowered, but I wanted to be there when they lowered it back into place. The entire procedure took around 90 minutes, and four men (with me helping 5) to complete the job. At times it looked like a "chinese fire drill". Granted this yard did not do a ton of sailboat masts, but it was a tough job. The Travel Lift was equipped with the appropriate crane, but with the radar dome, and all the wires that needed to be re-connected at the base of the mast it was tough work. At one point I yelled to the yard owner (who was working the crane) that god might strike me down for saying this, but he earned every penny for this particular job. Of course the $500.0 to paint my bottom was a total rip off, but this was real work and a huge liability for the yard. I hopefully have made my point that this is a job for a professional, with the right equipment. I do not plan on taking the mast down every year, but last year was an opportunity to get some much needed work completed. Good luck.