Dying natural blonde hair red? ANSWER!!?

hello friends :) i have never dyed my hair before, and now... i feel like it's time. I want to go red. some people are advising me not to because they say that i'll never get my natural hair colour back... so idk. i really want to dye it! but i want to know all of the precautions, and aftermath kinda... show more hello friends :)
i have never dyed my hair before, and now... i feel like it's time. I want to go red. some people are advising me not to because they say that i'll never get my natural hair colour back... so idk.
i really want to dye it!
but i want to know all of the precautions, and aftermath kinda stuff i should know before dying it.
this is the colour i want :
http://www.google.ca/imgres?imgurl=http://www.nichview.com/Celebrities/top20_women%252010y/kate-winslet_11.jpg&imgrefurl=http://www.nichview.com/top_20_women.html&usg=__QsetdwY-Dopl4tTLZDhDPLeMk3E=&h=500&w=367&sz=31&hl=en&start=37&zoom=1&tbnid=-ZQsftEQU-lWEM:&tbnh=154&tbnw=115&prev=/images%3Fq%3Dkate%2Bwinslet%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26sa%3DN%26rls%3Dorg.mozilla:en-US:official%26biw%3D1680%26bih%3D834%26tbs%3Disch:10%2C714&um=1&itbs=1&iact=rc&dur=274&ei=xbOjTOH3HsT48Abjg93zCQ&oei=wLOjTI_PI4ednAew0IWJBA&esq=2&page=2&ndsp=37&ved=1t:429,r:15,s:37&tx=73&ty=62&biw=1680&bih=834
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