I waited about a week to put mine on. I cleaned the area that i was going to fit the decal to, then i used soapy water in a spray bottle to spray the same area and the back of the decal. Peeled it off and stuck it down. The water helps you to adjust the location of the decal. One other tip is to work out where it will sit, use masking tape and stick ONE side of the decal to the machine, then spray it with water and slowly remove the backing while sticking it down. A helper sure does help here, don't over work the decal, it will stretch if you rub it too much to try and get the water and air out from underneath.
Drive chain, i was quoted about $50/metre from a mate that sells wire rope and chain. Measure your old chains with and length between pins, then count the links then you will get the rite size.
I hope at least some of that makes sense....