Why hire help on a sheep hunt? The only hard thing is if you are chasing a score. There are plenty of guys that will go on sheep hunts for free. Finding them is not hard... If you HAVE to have, say, a 170", then sure, hire someone that won't tell you a 165" is a 170".
I feel like some guys put too much emphasis on score, when it comes to getting a once in a lifetime sheep tag. Find "the look" you like. Spend as much time scouting as you can to understand the class of rams in your area. Enjoy the hunt and don't put any extra stress on yourself because it's " once in a lifetime." There's a reason the success rates are damnn near 100%.