I've also knitted bears and the knitting part isn't hard at all. However, seaming and putting it all together can be a little tedious.
Don't let that discourage you if this is something you really want to do. Seaming isn't difficult, it just takes time.
If you are going to change yarn, I suggest knitting a large swatch to make sure it is the look you want. I made a bear once that took me several swatches and needle-size changes before I got the look I wanted.