Work hard - it's actually the path of least resistance. Slackers get extra work and the crappy jobs.
Working cattle is an art and not everyone knows how to do it no matter their position or how many cows they've worked. Be willing to learn, ask for explanations, and learn to recognize it done right and why it's right.
Recognize that if you're working with idiots, sometimes it doesn't matter how quiet you try to handle the cattle, and it's not your fault.
Realize that sometimes it is your fault.
There is a place everyone working belongs in relation to that herd. If you don't know where you belong - ask - and find out why so you don't have to ask again.
Watch The Cowboys with John Wayne. Maybe some places are gentler trainers - but most of the time learning to work cattle right is a painful crash course.
Learn to accept constructive criticism with a good attitude. If you're at the bottom of the ladder you'll get a lot of it.
If you're working a job with more people than just your boss - find the people who know what they're doing and learn from them, not the ones who think they know what they're doing.
You can usually learn something from everyone - usually.
Every operation runs things a little differently - different is neither good nor bad.
Doing things right the first time equals more time for other things.
Fixing fence is an art form too. If you're lucky enough to have a job where they know how to do it well and care about it - put the effort in to get good at it. You'll begin to appreciate a good fencing job when you see it - regardless of whether it's yours or not.
Figure out what you don't know and make an effort to pick up some skills that will make you a better candidate for the next job.
The work ethic and communication skills to work for minimum wage at the bottom of the team are not the same as those expected from the good hands - or those who lead the team. Unless you plan on being at the bottom forever, work on more than just your cow/horse skills.
Lastly, have fun. It's a learning opportunity that people who have families, houses, pets, kids, etc can't do - so enjoy it.