Not advice, but simply what I try to do; trade your way into a bit of a cushion. Everyone is always worried about the bubble bursting. The earlier you get in, the better, then just manage it and derisk as you go. Bubble could burst today and in something like CRSP for instance, I could lose everything Ive got currently in the name and still have nearly 7x my initial investment. Take the initial stake(ideally a smallish sized position), trim aggressively until you recoup your capital, and buy the dips with discipline. Worst thing that happens is you lose your allocation if it goes to 0. SE aint going to 0.