Tuning acoustic and classical guitar the best way

Now i want to learn how to tune my strings to the correct sound but not sure how to do it. I bought the peach pipe and i think it sound very different and very hard to tune. I dont want to use electric tuner because i know i wont be learning anything from it. Now i've got Guitar Pro installed and wondering u can listen the sound that GP produces and tune it on my guitar? Is this possible or you've got some other ideas for me? Thanks!

For acoustics (classical included) I only use a tuning fork, "A" 440hz in particular to get that string to the "standard" tone . From there I do as follows:

previous post

A picture of one in case you have no idea what a tuning fork is.