Repotting S/H

[DTEguy]

Hi folks,

I am currently moving my small modest collection to S/H after my newbie success with an oncidium.

I was wondering how does one repot a S/H orchid? I have seen pictures of people moving an orchid with a huge glob of roots with the existing LECA to a new pot. Should one be cleaning out the dead roots that was transitioned into S/H? Do they get stuck on LECA tightly that one should not attempt to remove it?

I am asking this so that I can make a wiser decision on pot size and roots trimming. Thanks!