powerbook wallstreet 1st generation overclock. anyone done it?

i'm looking into upgrades for my wallstreet that i wanna do while fixing it. currently i have some ram waiting to go in and possibly a 60gb hard drive if i upgrade my other computer. there's numerous overclock pages for the wallstreets, and i've seen some that go up to 300mhz which is what i want. a few things i'm wondering. how stable is it upgrading from 250 to 300, and is apple's 300mhz processor exactly like the 250 but clocked differently? i'd like to hear any experiences in case i'm risking killing my computer.