Removing Stickers: 

Sometimes it is pretty tough to remove a sticker from your bodywork or any surface. 
Here some tips that may solve this problem. 

Hair Dryer:  Use a heat gun or hair dryer to heat up a small region of the sticker or decal.  
This will make the decal more pliable and reduce the adhesive bond.  
Just be careful not to overheat the bodywork or the paint may blister. 

When the sticker is off, there may be lots of residues from the sticker’s glue.  

One good remedy is Ronsonol Lighter Fuel:  
With a piece of rag apply the Lighter Fluid over the glue. It should dissolve the glue and you can easily rub it away with the piece of rag. It should work well in most cases. 

There are, however, tougher glues and the Lighter Fluid may not work as expected. In this case, there is “The Ultimate Remover”.  It’s Goof Off Remover:  
It is stronger than the Lighter Fluid and you should be very careful not to damage the paintwork.  Try it in a small inconspicuous area of the bodywork to make sure the Goof Off Stuff will not damage the paintwork.  
It should remove any type of glue from Stick Ons (also removes Chewing Gum, Dried Latex Paint and other hard to remove glues). 

When the stickers are off and the glue residue completely removed from the paintwork, apply some polisher to get the area clean and shining. 

Installing Vinyl Stickers: 

Installing stickers without leaving bubbles and positioning it may not be an easy task, specially if you are dealing with large stickers. 

Get one plastic bottle with water and add a couple of drops of dish-soap. Mix it and lightly spray it over the bodywork and on the glue side of the vinyl sticker.  

The water and soap mixture will allow you do move the sticker around to the desired position.  

When you are happy with the position of the sticker, get one credit card and slightly slide it over the sticker, pushing the water (and air) out.  Start from the center of the stickers pushing the water to the outside edge of the sticker.   The water + soap solution will "slide out" of the sticker and taking any air with it.   Go slowly and lightly on the sticker as to avoid scratches.  

Now use the waxed paper back that you removed from the sticker, put it over the sticker with the wax facing the sticker.   Now you can slide the credit card more vigorously without scratching the paintwork or the sticker. Slide the credit card over paper forcing any remaining water-soap solution to get out from between the sticker and bodywork taking with it any remaining air. 

The result should be a sticker over the paintjob with absolutely no bubbles and very smooth. 

While applying the sticker, if you need more time to position it, apply a bit of more water, so you always have the condition to reposition the sticker. Do not let it go dry, or it will stick and you won’t be able to reposition easily. 

For very large sticker, spray additional water and slide the credit card carefully and smoothly from center of sticker out.  Be patient and attentive to bubbles. If there is still water-soap solution in between sticker and bodywork, you can always reposition and remove bubbles without much trouble.  

When the water+soap solution is completely out and you carefully started drying out the area with a piece of rag, make sure that the sticker is completely free from bubbles and with your finger tips remove any remaining little bubbles by pushing them to the outer edge of the sticker. 

Now make sure that all edges are well glued to the surface. 

Dry and clean the area with the piece of rag and... 
you should have a perfectly installed sticker, with no bubbles at all. 

Applying vinyl stickers over uneven surfaces (as to apply the number place background sticker to the front fairing, which in most cases is a rounded surface): 
Use the methods above to avoid bubbles, but use the hairdryer to "mold" the vinyl to the surface, i.e., heat the vinyl so it is more pliable and you can slowly and patiently "mold" it to the format of the surface.  As you are wetting the glue side of the vinyl (to enable you to reposition it) and at the same time heating up the vinyl with the hairdryer (to enable you to mold the vinyl to match the surface), you will need to be very careful to keep up with the job (two people should work on it) and be attentive to avoid spraying water to the hairdryer.