I bought hair dye to try dyeing my hair myself.

It feels like it's time for a root touch-up again before I knew it, but getting it done at a salon costs too much... The cost of a root touch-up is quite a burden. So, I happened to watch a home shopping channel recently and saw this hair dye being sold. It looked quite convenient, so I'm thinking of giving it a try. They were selling such large quantities that I couldn't buy it there. You know, it might not suit you after trying it. I saw it was being sold online too, so I bought two just to start. Will I be able to do a good job dyeing my hair myself...? I've never done it before, so I'm scared I might mess it up. Has anyone used this hair dye before?