It's real easy and the results are basically perfect!
Here is the picture of before:
These are the nail polishes that I used, but any other brand is fine and you'll also need some tape:
First I took off the old nail polish, then I shaped them my nails and took of the cuticles:
After that I cut a piece of tape and put it on my nail as far down as I wanted the French tip, then I put on the white nail polish and waited till it dried then took of the tape carefully:
If there is some white where there shouldn't be then just get a toothpick with a little cotton around it and dip it in some nail polish remover then take off the excess white nail polish:
It makes a big difference when your nails are done, a lot of people asked me who had done it and I was proud to say that I did it myself, so have fun doing it, I hope you liked it and follow for more tutorials like this!