QUOTE(aba9785 @ Apr 29 2013, 11:20 AM)
blade for sticker? hmm...wont scratch ur brick?
my blade skills for gunpla too sucks until i dare not use it on lego
last time i usually usually use another axle to push the other axle inside one...
now mostly rely on this brick separator...

yeah, I used to use another axle also, but the other axle not enough grip on fingers and the end push onto palm of hand, very painful if need to adjust many.
My brick separator is old type ... without the axle-point.

Waiting for the Constitution Train Chase which comes with the orange new one.
For small size stickers like 1x1 or 1x2 or 1x4 or even 2x4 (good examples are the Shell Lego cars promo) , here is what I do.
- Fold and peel out nicely. Use finger/tweezer, but don't touch a lot of the sticky part.
- Stick one end about 1mm or 0.5mm of the sticker back onto the sheet (with wax base). Or a small sheet. Not too hard, just let it stick lightly.
- The lego part to stick, join with other bricks to make it bigger to fit your hand nicely, or stable enough on table/floor.
- Then align the top portion of the sticker (furthest away from the end which is still stick onto sheet), press a bit to stick it. You can use the bigger sheet to twist/align slightly before press.
- Press one side (left/right) down. Check if the alignment is ok or not. If not ok, press the sticker sheet firmly and slowly pull out. Repeat above again.
- If satisfy ok, press the whole thing down. Then slowly tug the sheet and it will come out. Press the remaining onto the Lego brick firmly. Voila !
For big sheets, like #9398 panels which are like 4 x 10, this is what I do:
- Tear/cut out each piece as per perforated lines.
- Fold and peel out 60% , but don't take out first.
- Cut the wax-base-paper into 1/3 or 2/3 portion (one side slightly bigger than the other). Stick back as per original. In this way, your sticker is still intact, but the base is divided into two.
- Measure the sticker onto panel, see which alignment you want.
- Use the extra leftover sticker (cut into small tiny 1x10mm) to hold down the bigger portion (the wax-base-paper cut above). Normally I just use 1x on the left side.
- Press with thumb firmly on the left side.
- Fold up the right side, peel out the base, and smooth it out from left-to-right and it'll stick nicely. If not, you are in trouble already. Peel out, stick the base back, repeat the entire procedure above.
- By now, the sticker should be aligned already. Release firm left thumb.
- Lift up left side, tear the remaining base, and smooth it out from right-to-left.
- Voila ... done.
TL;DR , here's the summary:
- peel
- align
- stick
- voila!