Exude self-confidence and intelligence

Nah. Just be yourself. The movie Dead Again has a terrific line (delivered by Robin Williams character) that goes something like "Just decide who you are, and be that person." Don't make apologies, or force yourself to be someone you aren't -- if you want to be a better .. programmer, then .. take on the characteristics of a better programmer.

Here's my For Example: after a disappointing dental checkup, I decided I was going to be someone who flossed and brushed every day. Yeah, that's a small thing, but if it means I get to keep my own teeth rather than going to dentures (ugh), it's important. I haven't missed a night of flossing and brushing in six months -- and yes, the oral hygenist did notice.

Try to fit in

Nah. Be yourself, fitting in with local customs as necessary.

Don't be late to work

Nah. I have to make lunch for my step-sons and do various other duties around the house. I get in when I get in, sometimes closer to 9am, sometimes closer to 10am. And anyway, I have a VPN connection to work, so I can check and fix most things from home.

Don't step on any toes

Well, OK, but express your opinion too -- I'm in the software development business, and I'm expected to use my brain and make suggestions, where appropriate. When the matter starts to take on political overtones, certainly it's wise to defer to your seniors.

Be paranoid

I would say, to paraphrase Larry Wall, Have the appropriate amount of paranoia.

I use company time to do personal stuff on occasion. But I also use personal time to do company stuff. I figure it balances out. Therefore I'm not paranoid.

Cast a critical eye on your new job

Sure. Then again, searching and finding a new job is not my favourite past-time. Getting the one I have now was actually fast and quite pleasant. I'm not really looking forward to the next time.