mirror lock canon 350d

[DAVID LYDIATE]

I am buying the Canon350D and am refering to the quote from the Msgic Lantern guide below

"Once set, the mirror will lock up when the shutter button is pressed. Press the shutter button again to make the exposure. If, after 30 seconds, you don't press the shutter, the mirror will flip back down" the para then adds "When using the Self-timer with bulb exposure and Mirror lockup, you must keep the shutter depressed during the two-second Seft-timer countdown, otherwise you will hear a shutter but the image will not be captured"

My question is that if you keep the shutter depressed during the two second countdown, this could caise camera shake? ie pressure on shutter as it is depressed.

[Caboose]

use a cable release.