mk2 audio unit upgrade

hi

im new to this forum

i am using an octavia 2006 lan k mkii 1.9 pd

the oem unit is audience mp3 which is damn good

but the screen has been damaged making it difficult to see

im planning to fit bolero mp3 on my octy

what guidlines should i take

i dont have much knowledge about swapping head units !!!!!!!!!

cheers

targus 999