I would definitely use a secondary for a pilsner, after ensuring the beer has been on the yeast long enough to get rid of any diacetyl. Here's what I would do:
(1) pitch 1.5 million cells per ml of wort per degree Plato to ferment at between 45 and 50 degrees (depending on the yeast strain).
(2) hold the fermentation temperature until you are something like 8 points above expected FG: 1.020 is a good rule of thumb. You can't just say "I'm going to ferment it for ___ days." It will depend on how fermentation progresses.
(3) allow the temperature to rise to somewhere over 60 degrees. I usually just go to room temperature. This is your "diacetyl rest" that allows fermentation to finish off strong, and helps prevent the formation of diacetyl in your beer (slick, oily mouthfeel with a buttery flavour). A d-rest is not always necessary, in fact it is not often necessary. But I always do one; it costs you nothing and can save you a lot of trouble. I especially recommend them for new lager brewers, who are more likely to underpitch, which is one of the main causes of diacetyl.
(4) once you have reached FG, rack your beer into a secondary and take it down to lagering temperatures. I usually just crash it; some poeple take it down 3-5 degrees per day but if fermentation is complete it probably doesn't matter. Lager it as cold as you can for as long as you can stand. It can be lagered in a keg (pressurized or not) or carboy. Extended storage at cold temperatures will help your beer develop the crispness that partially characterizes lagers. Flaws also tend to smooth out over time.
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