I have an Ugg crossbody bag that I would like to dye a darker color in the brown family (my bag style on the left, color of my bag in right picture).  I have NO idea how to do this. I bought Fiebing leather dye in 'dark brown'.  I would like my bag to come out similar to the color in the left picture.  My choices of dyes were 'saddle tan' and 'dark brown'.
	 
	
		I know I am supposed to prep the bag first....but how?  I have read about Fiebing 'deglazer' and Mltonian 'Nu-Life Color Preparer'.  Please point me in the right direction of how to darken this bag and not ruin it  
	
		Thank you for your help!