If you would never say, "I am going to attempt and climb that tree", why would you ever say, "I am going to try and climb that tree"?

TRY implies doubt regarding the outcome. AND removes the doubt. So, when you say "try and" you are being contradictory not to mention inefficient if you really mean "TRY"! And, if "try and" is what you really mean, then saying, simply, "I am going to climb that tree" is direct, accurate and correct.

And, common usage be damned. The Brits are NOTORIOUS for saying "try and" . . . King's English my ass!! It's just plain dumb.

It is almost never correct to say "try and" unless you are listing two words and "try" is the first one.