I was timid with spiders when I first started with Ts. I did a ton of research before getting my first and decided to start with slings. I now have 23 beautiful Ts from adults down to tiny baby dwarfs (Hapalopus sp. Colombia). I love feeding them and watching them in their enclosures but I do not hold them. I have all terrestrials and if I had an accident with one and it fell it would be tragic. I respect them for what they are- A tarantula not a puppy. I have G. rosea (I don't think this should be a first either) all the way to an OTB (orange biting thing). They all are different even within a species. Take the time picking one out just like you would a snake. Just because they are cheeper than a $900.00 BP doesn't mean it should be treated with less respect. There are a ton of really knowledgeable T people on BP.net so don't hesitate to ask them questions.
PS I would also bite if someone shoved something in my mouth too!