Pyramiding isn't a strategy or a trading plan... it's part of one of these perhaps, but if someone asked you how you traded a market you could hardly just say 'I pyramid'... pyramid how? where?
Anyway, my advice would be the obvious advice - if you're going to do it, make sure your pyramid is the right way up, i.e. get your size on early; don't buy 1 lot and then buy 10 lots when you've got that trade nicely onside, as it will only take a small correction to wipe out the profit in your trade and make you get twitchy.
Scaling out is something I do often, as a bond trader I think is usually a decent idea to leave something on the table, especially on the long side, for those times when the market catches a big drive and doesn't stop; it's much harder to get back in, buying a market that's glued to its highs having sold out a couple of bps lower.
SL
If my auntie had b0ll0cks, she'd be your auntie.