[NickyC]

Hi everyone,
I've been lurking on these forums for years, but this is my first post. I never bothered registering because hey, what the hell could little old me add that nobody here already knew? Anyway, I'd really appreciate some advice if you don't mind taking the time to answer.
Quick background on myself. I started playing poker about 5 years ago. I am strictly a LIMIT Hold Em player. I have played $1/2 and $2/5 no limit on several occasions, but I never felt comfortable in the games and went back to my low limit LIMIT games.
I have never played a limit game above $5/10. I have however played $5/10 with overs on countless occasions, so I have to admit the highest level I have really played is $10/20. I'd say 90-95% of the time however, I play $3/6 or $4/8 limit hold em. $5/10 is my game of choice, but it rarely runs except for on the weekends at my local Casino.
Anyway, over the past 18 months, I have run up a poker bankroll of around $20k playing just the limits I mentioned above. I play poker generally 2-3 nights per week, and from anywhere to 5-8 hours at a time. My bankroll is ONLY for poker, and is completely separate from paying bills, shopping, etc. I have had dreams all along of moving up in the limits, and I think I'm ready to take a shot.
Anyway, my main problem is one of confidence. The limits I want to move up to are $20/40 and $30/60 limit hold em. Since you don't know me, I have to let you know I am not a gambler by nature. I play no casino games other than poker. I have never even played a slot machine, and one time at the blackjack table was enough to convince me it's just for suckers. Hell I don't even buy lottery tickets.
The problem I'm having is that since I am used to just pushing $6-20 out per bet, I'm really worried that when I start pushing $40-60 I'm going to be nervous as hell and look like a complete novice bafoon. (Not that I'm not a complete novice bafoon, just that I don't want to be outwardly seen as one).
What I'd like is advice on whether or not I should even move up in limits. Is $20k enough to take a shot at these higher limits, or do I need more? As well, I play a more tight, passive game of poker. Since I'm not a gambler by nature, I pick my spots very carefully. In fact, I won't even play at a game with less than eight players. I have sat and watched the games I am considering joining (30/60), and have noticed that these games play much more aggressively than I am used to. I'm used to seeing flops for the minimum preflop bet at 3/6, but often times I'm seeing 3/4 bets preflop at 30/60. Do you think my game is suited for this type of style?
While I wouldn't say I'm a good poker player, I do have dealers/players ask me all the time why I haven't moved up in limits. I've even had dealers offer to stake me in the bigger games at a 50/50 share. I'd never borrow money from anybody however, I want to do this all on my own.
So please, any advice you have time to give me would be great. As well, this is strictly for live poker. I don't play online. Thanks so much!