I've had an Apple/Barclay card since 2005 when my university was subsidizing the cost of a new MacBook Pro for all of the students. The 24 months same as cash/no interest is an excellent deal, and with the funds you have coming in on a monthly basis you certainly should be able to budget to take advantage of the opportunity.
As a previous poster indicated, you definitely do not want to fail to meet the requirements of the terms - if you do you will end up paying the total amount of deferred interest, which is what they are betting on.
Also, once you've received the card be very, very careful about using it for anything else. Why? Because they charge usury amount for interest. That is, they charge the highest legally allowed interest rate for the state you live in. Where I am it's 28%. I would also add that they have absolutely no desire to lower or incentivize any purchases after your initial purchase, so don't expect to get future offers of 0% interest on this card. The initial offer is just to get you in the door and on the hook with them. I also find it interesting that this is the only revolving credit account I have that doesn't try to get me to transfer balances for a reduced or 0% interest rate, either.
I have a good credit score. On a lark a year or two ago I called them and asked for a reduction in the interest rate on the account (I have used it occasionally over the years just to keep it active, paying off the balance the same month to avoid interest charges.) They showed absolutely no interest in reducing my rate, despite my suggestion that I would be more inclined to used the card and carry a balance if they would. The customer service person seemed indifferent and made no indication that they would ever consider it.
So the card sits in my desk drawer and gets pulled out maybe once a year to buy something insignificant just to keep the account active.
Take advantage of the offer, pay it off in the time allotted, and toss the card in a drawer. If anything it will help to build your credit.
MacDann