But shall i do it professionaly and how much will it cost, i'm not particually botherd about the price just concerned it wont work, im medium brown now with a hint of red and would like to at least go a lightbrown/blonde colour like jennifer aniston has, will this be ok after my past of hair dyes, as i had that little bit of alopecia as some may remember me mentioning.

Beauty salons may charge different prices depending on your hair length or the type of service you want. In order to go from dark to blonde, it will require bleaching and toning. This type of process can damage your hair and scalp if it's not done correctly. If you have had alopecia, you should check with your doctor before you use any chemicals on your hair.

It was only like the size of a ten pence piece and has cleared up now, i have semi short hair.

You should still check with your doctor, just to be on the safe side. If you are recovering from alopecia, you should avoid bleaching and coloring your hair. But only your doctor can determine if it's okay or not to color your hair.

Is there anyway i can do it safely, someone told me to grow it out, but as my hairs like a mahogny colour, its gonna look terrible, what shall i do?

Oh btw i am a natural blonde, sorry