2/6 isn't that bad for Cheltenham. Every horse has very good form and has a chance so finding the winner is is not easy. You'll just as likely to find the winner going by a name you like or a horse that you like the look of.
Having said that I once went to Cheltenham many years ago on a Corporate junket. We had a jockey come in to "mark our card" I collected a couple of quid from each person at the table and put it on a "placepot" accumulator. It was a great moment at the end when I counted out a couple of hundred pounds to each of us.