A couple of years ago I transferred a 13 inch pleco from a 35G to a 75G. I just bought the largest net I could find, then very gently put it around him. His tail was hanging out of the net, but he was extremely calm through the whole thing, and never attempted to thrash or jump. I then lowered the net into the new tank, and slowly removed it from him. Even then, he didn't quickly swim away or freak out. He just calmly glided off like nothing had happened.
Hope your experience is as good as mine!