I use YouTube to learn how to do almost everything. That or I just keep doing it wrong until I get it right or at least some variation of good enough. Usually lifehacker has guides on stuff like that too.
Edit: Just noticed this in the kindle deals section. Haven't read it but it's well reviewed and inexpensive. http://www.amazon.com/gp/product/B00HG78RKA/ref=s9_hps_bw_g351_i16?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=merchandised-search-6&pf_rd_r=1H6N1TF6CQD9HW8CFT0T&pf_rd_t=101&pf_rd_p=1750526362&pf_rd_i=154821011