Alternately get a mobile sign guy to come out and apply the artwork for you. Then you dont need to worry about stuffing it up, because they'll guarentee it.
Make sure the vinly is high quality, preferably 3M stock, thick and guarenteed for at least 7 - 10 years in outdoor conditions. That will ensure that it lasts probably twice that time indoors.
Quality of vinyl is really important, one guy might charge you $50 less and then you'd end up with cheap no-name vinyl that peels off and fades after a relatively short amount of time.
But dont worry about the cutting, they do it for you and its done with a computerised plotter, so it'll be a perfect cut.