Any tips on an infantryman preparing for his first deployment?

Applies to any unit, MOS, or deployment. Get your home in order so your family is taken care of and you don't have any distractions. Not just the obvious admin and finances (will, power of attorney), but a small notebook with contacts for wife if she needs help. Command phone numbers and all the usual financial stuff, but things we often take for granted. If she will have a relative nearby to advise her, that would be helpful. Beyond that, contacts for things that might come up with the home. Mechanic for vehicle(s), home maintenance and repair folks, and anyone that can advise her when the unexpected happens. We naturally assume that spouses will know how to handle the unexpected, but they often don't. It will be stressful enough on all of you, so the more information you can provide, the less additional stress. Otherwise she is at the mercy of providers that often take advantage of women. There are good resources through the Family Assistance folks aboard base and the Key Wives of your Command. Make sure she's armed with more than just the Yellow Pages and checkbook.

Edit: I focused on preparing things at home, because when you are in the AO you need to focus on things where you are, instead of at home. If you are distracted by wondering if you left things at home in order it will impact on your state of mind in the AO. Leave her in good shape and you focus 110% on the mission there. Others here have given good advice on your conduct once downrange, and that's all very important. If you are having difficulty it's best to keep it there, because it will cause your wife to worry. It's not in her power to change, so don't burden her with it.

Remember your training,pay attention to your Officers and NCOs ,pick up as much as you can from the people who have been deployed,as noted in previous posts keep home and it's distractions from clouding your judgement in a hostile environment.Good luck Brother.

Just stay focused as best you can. Keep your cool and situational awareness. Heed the advice and guidance of those that have gone before you. You can do this. It will be rough, I won't lie. But it can be done. Make sure you call/write home as much as possible.