Pants Never Get Dirty

Best ways to get a taxi in downtown San Francisco?
I will be interviewing in downtown San Francisco next Friday. I intend to take BART into the city. However, the best location is still 30 minutes or so from where the interview will take place.
I’m concerned about the rain and the fact that I really want to make sure the interview goes well (I don’t need to fall and get dirty or rip my pants or cut my hands, etc.)
What’s the best way to hail a taxi in SF? Call a company? Stand on the sidewalk and wave like a tourist? Jump out in front of a car? My only experience was in Boston, and I know calling a company was useless there. I found that walking down the sidewalk with a huge piece of luggage did the trick, but I won’t have luggage here.
I’ve never taken MUNI before (parents had a thing against it, don’t know why), and would not want to possibly risk being late. I would also prefer to be dropped off AT the interview location. Suggestions?
Yes. Here is another San Franciscan to recommend you take the BART to the Embarcadero Station, walk up and to the hotel right at the foot of California Street (where the cable car stops). That is the Hyatt Regency. There are sure to be cabs stopping in front, and you can wait out of the rain where the cabs pull in. Or, you can get off the BART one stop earlier at the Montgomery Street Station, walk upstairs to the Palace Hotel, where there is a drive-in entrance at the side. They usually have cabs there as well, or even on Market Street, if it is not raining.
Barack Obama vs George Bush in a Pants on the Ground Dance off. General Larry Platt,American Idol..