Dark vs Modern Circuit

I have an AVRI 62 Tele that is in all orig. setup. If I decide to change it from the dark to modern circuit how hard is it and can it be changed back pretty easily if I don't like it?
G

It is very easy to change & can be put back 'vintage' but betting you won't want to.

My AV62 is 'modern'. Had an AV52 w. the 'vintage' wiring & it I changed it after about 5 minutes play time.