After removing old hands (see hand removal) find the hole size of the hands needed.
Find the hole size by using gauge or by using a digital gauge measure the hour wheel and cannon pinion diameter.
Find the length of the hands needed by measuring the length of the hands from the middle of the hole to the end of the hand.
Find the style and color of the hands needed.
Put the hour hand on the post first lining it up at the 12:00 position.
Using hand tool press down on the hour hand with even pressure.
Follow step 5 and 6 for the minute hand.
Using the opposite end of tool place the sweep second hand on and apply pressure.
Reassemble the watch and set the time.