How can I fix my highlights?

i recently went to put highlights in my hair took cosmentology in school but have a problem doin myown hair for sum reason, i put blonde brown and red highlights and lowlights in my hair and the red was one of those bright reds but i figured if i didnt leave it in long it wouldnt get as bright but after foilin my hair, when it was time to rinse it out i took the foil out and went to wash it out the blonde and red tuched and then died sum spots of blonde pink so then it looked horrible so i went back n got brown die to try 2 cover up the red and pink and it just made it worse it then died my hair a dark burgendy red, then i went to get something to remove the haircolor and it turned my hair orange on the top where i put the highlights so i had to go back and buy a brown to dye al my hair i would like to get blonde and dark sandy blonde highlights and hair extensions but if i went to a salon would they be able to fix whats gone wrong with my hair and get it back to those lighter colors? and add hair extensions?