It is very easy to teach baby sign language to your child.  Don't be intimidated with learning a new language.  Think of it as learning a new "word" only.  You don't need to be able to have entire conservations, you just need to be able to communicate a word or two to start with.

First, you need to familiarize yourself with the signs you want to teach your child.  Then, you need to be comfortable making each sign.  Practice in front of someone or the mirror.

Each time you present your baby with an item, show them the item, say the word and make the sign, all at the same time (or thereabouts).  That way, your child will associate that item with the word (which they probably already do) as well as the sign, since the sign and the word are done simultaneously.   Soon, you will find your child making the sign!

One last thing to note – ensure you have your child’s full attention when you are introducing and reinforcing each sign.  You want your baby to see what you are presenting for them.  You want them to see the teddy bear, hear the words “teddy bear” and see the sign for teddy bear.  When they are crying or otherwise distracted, it is not a good time to “teach”.  If your baby wants his or her teddy bear and is sobbing uncontrollably for it, appease him or her with the teddy bear.  Once they are hugging it and happy again and you have their attention, point to the bear, say, “teddy bear” and make the sign for teddy bear.