I have been in IT for about 25 years. I have lost more certs than I can remember. Most of mine have been for various flavors of unix. The problem with those is that the certifications expire, and they are expensive to keep up to date, and not nearly as useful as OTJ experience. But I would include them on your resume if you have some behind you. If not, wait and get them on the employers dime.
Be prepared to talk at length about specific projects you handled, the difficulties you overcame, and the benefits it provided your employers, coworkers, and yourself. Interviewing is an art in itself, and you get much better at it as you go thru the process. The problem is you may be unprepared and caught off guard on early interviews for great jobs, and you only get one shot. You learn a lot when they ask you those questions you know you should have rehearsed but you did not, and they will!
Your employment history will definitely help, so review your entire career, and make notes of your accomplishments, and be ready to sell yourself.
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