What the heck, go for it! Size isn't a huge issue with children's clothing, and making children's clothing first is a great way to learn shaping and construction of clothing without investing tons of knitting time.
Take it one step at a time, and if you get stuck anywhere, you know there is lots of help available here.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry