Polly is doing a free pattern every month and this dress is Febuary's. Pop over there (the link is in my sidebar) and take a look at the goodies on offer.
This is a super simple pattern to knit. You need 2.75mm needles and sock wool or 4ply as I always use :-P
You need to be able to cast on, rib, stocking stitch, increase in the front & back of a stitch and cast off. Simple!
I added a picot hem to this which turned out to be really unruly despite being blocked twice. I ended up popping a running stitch through the hem to calm it down.
This is a simple and satisfying project to have a go at and I would say beginners should manage this no bother.