Every single job is a challenge. You are walking into a new set, a new character, creating a world and trying to get comfortable to do your best work.
Always Do Your Best. Your best is going to change from moment to moment; it will be different when you are healthy as opposed to sick. Under any circumstance, simply do your best, and you will avoid self-judgment, self-abuse and regret.
You must accept that you might fail; then, if you do your best and still don't win, at least you can be satisfied that you've tried. If you don't accept failure as a possibility, you don't set high goals, you don't branch out, you don't try - you don't take the risk.
Nobody can predict the future. You just have to give your all to the relationship you're in and do your best to take care of your partner, communicate and give them every last drop of love you have. I think one of the most important things in a relationship is caring for your significant other through good times and bad.
Always do your best. What you plant now, you will harvest later.