Hi there,
I agree with the other posters, that the first few runs (especially the First Run!) are by far the hardest, but mostly because of the fear of it being really difficult and not enjoyable - but once you get out there you will remember what it was that you loved about running. You might even be surprised at how good you feel even in the early days.
One lovely way to boost your confidence and make you feel good when you are out and about is to head to your nearest running shop and treat yourself to some really exciting, special new kit - we all deserve to be spoilt every now and then, and if you look, and feel, good in your running gear you will be much happier when you are putting it on!
That's about all that I can offer that hasn't already been said, but I just wanted to come on here to offer some support anyway.
Total respect to you for coming back from such an injury and running a marathon, you could probably teach the rest of us a thing or two about motivation and perseverance!
Best of luck with your comeback, I hope you get back out there soon and get your running buzz back!