home blackjack dealer, can i handle variance?

I would like to be a casual blackjack dealer just for fun with my friends.

Let us assume that all bets are $5. How many hands would I have to deal to have a 90% chance of coming out in the green? 95%? What if the size of the best varied randomly between 1 and 10?

My friends are all idiots and stay on 12 when i have a ten showing, so lets assume that i have a 5% advantage (Without card counting, isn't the bets a player can do about 1% below the casino?)


Thanks for the help,

lemme know if I need to be more specific about anything

-Grant