I’m in a parish now in which most of the boys are teenagers and away at school, but come back for summers and vacations. We don’t rank anyone, but have a list of what they can do in the context of a Missa Cantata (EF). Solemn and Ponitifical Masses and Holy Week need special practices. Three men, myself included, can take on the role of an MC, one of whom we only have once a month, so the other fellow and I alternate between MC and thurifer. We are training another man to serve as thurifer at present. Normally, a father and son serve as acolytes, alternating sides each week. Another man – a former seminarian and thus our go-to subdeacon for solemn occasions – divides his time between the altar (where he is usually the crucifer) and the choir loft. Occasionally we have a boy from out of town visiting family whom we assign to the boat or to second acolyte, and a seminarian will vest and not serve, but will chant the epistle when he is home. For processions, we borrow a cantor from the choir and vest him, and a sacristan at a local shrine is usually able to give us a hand on our request for nuptial and requiem masses and Holy Week. For Pontifical Masses or bishop’s visits, we have a call list of people involved in other TLMs in the area and MCs in local OF parishes whom we can call upon in advance for help with the pontificals and so forth. Alas, we have no boys we could assign as torchbearers, and the lack of another interested priest or deacon who can easily get away from his pastoral duties means that Solemn Masses are rare.
So, in short, we don’t rank people here, but we have an idea of what they can do in the contexts of various Masses and other services. If we had many boys, then it would be well worth considering giving them rungs of a ladder, so to speak, to which they could attain through service and study. Among men, though, the attitude is more egalitarian in the sacristy, even though it might appear (we hope) very hierarchical and precise in the sanctuary.