Give it a whirl! Don't worry about what "someone" says. I quilted a jumbo queen on a Walmart Brother machine with about a 4.5 inch harp. It's far from perfect, but it's done, and it wouldn't have been perfect if the harp was 2 feet long. You have to start getting you skills somewhere. Do some medium size things and see what you think. Don't let "someone" set you back another 10 years!