I don't have a whole lot of experience on this front, since I've only had one job and it totally sucked, but I'll offer what I do know and what I think may help.
First of all, never come out at an interview or on an application. That could jeopardize your ability to get the job, and employers aren't actually allowed to ask before they've hired you. Once you're hired, fill out all the paperwork, get trained, and wait until you've started to say anything.
As for uniform, such as name-tag or male vs female uniform styles, you may have to say something before you actually come out if possible. For example, my name could be a shortened form of my birth name, so I simply asked if they could put a nickname on my name-tag. They agreed and printed Macks rather than my birth name, without me having to come out. However, if your birth name is, say, Jessica, and your chosen name is Steve, you may want to wait and have your name-tag reprinted after you've come out officially. Maybe think up a gender-neutral nickname that can work with your birthname. Given the example above, an option could be to use Jess until you can have it changed to your chosen name.
As for the uniform, ask to trade it for the right one after you come out. If you really can't stand the difference, then explain that you would be uncomfortable without explicitly stating your transliness. This shouldn't be an issue at most jobs, though, since many jobs use a gender-neutral uniform anyway. At my job, everyone wore the same thing, so it was all good.
After you've been working for a bit, you'll have to come out, especially if you're pre-everything and will have to get time off for medical and legal appointments.
Go to your manager, whichever one you feel most comfortable with, and explain everything. They can't fire you for it in most places, so you should be fine. Ask this manager if you should approach each other manager separately, but you shouldn't need to. If you have any problems with discrimination from co-workers or managers, go to corporate or the owner, or even the courts if you have to. Just make sure you're armed with evidence.
If they refuse to give you enough time off when the time comes, tell them exactly what procedures you're getting and let them know that if you're scheduled, you won't be able to come anyway. Show them proof of the appointment if you have to.
Other than that, it's just like coming out to anyone else. Correct them politely if they use the wrong name or pronouns. Answer questions politely and refuse to answer invasive questions just as politely. You'll be fine.
It really isn't as big a deal as everyone makes it out to be. You can do it.
If you have come out or are in the process of coming out at work, let us know how it's gone in the comments. I'm sure people would like to see how it's worked for other people.

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The Guide To Being Transgender
De TodoHere's a list of tips and notes that can help you ease dysphoria when you're transgender. These tips can work for both out of the closet and in the closet people. Enjoy:) DISCLAIMER: There is no definite success guide to being transgender. There is...