tiles around sink/toilet

[hotpink]

i am currently taking off the bathroom wall tiles. do i have to get a plumber out to take off the sink unit so i can get to the tiles behind? it seems to have been a bodge job anyway, the tile work is very messy behind there. any tips?

[hotpink]

thanks, that was a brilliant answer! i've never done it before, and i'll have someone with me to help me, so wish me luck;)