I am a cradle Catholic who is trying to catch up on my education. Our priests made a plea for help. I would be honored to be the servant behind the scenes in preparing for the Holy Eucharist, but I want to stick to tradition.
I would advise you first to find out what are the duties of a sacristan at your parish. It varies.
This function has been filled by men and women (especially women religious) for centuries. Don’t worry about that. Altar servers were male (and still are in the TLM) until recently, but not so for sacristans. If you are called to do this, do it. If your priest is OK with you doing this, you shouldn’t worry further.
I’m a daily Mass sacristan, and also serve as sacristan for special Masses. I open the Cathedral six days a week and prepare for the morning Mass. This means setting out the readings, preparing the sanctuary, preparing the sacristy, preparing the Missal for the priest according to the ordo, preparing the sacred vessels, scheduling altar servers and readers and EMHCs (being a Cathedral, we have altar servers at every Mass), and being prepared to sub, cleaning up after Mass, helping the priest or deacon with vestments as required. It also means turning the lights on, thermostat setting, opening all the gates, encouraging the homeless people who sleep on the steps to find a shelter, cleaning beer bottles out of the parking lot, and sometimes calling the police when Mass is disrupted. I’ve also been sacristan for Easter Vigil, Christmas Eve Midnight Mass, and other special Masses for which a normal sacristan isn’t scheduled, and Masses for the bishop. I also set up for baptisms, funerals, and weddings that are scheduled for later in the morning after my Mass.
You may do more or less than this; find out before plunging in. For example, our altar guild takes care of all of the linens (purificators, corporals, altar cloths) but I have to put out a new altar cloth every once in a while. We have a special group of volunteers that changes liturgical colors (on the ambo and altar, etc.) or puts up seasonal decorations and flowers.
We have volunteers that serve as sacristan for their one Sunday Mass each week. I fill in for them on occasion also. I’m also sacristan for TLMs, which we have once per month and sometimes more. That’s a totally different setup and the difference from behind the scenes is quite amazing.
The treasure received (for my work as sacristan) is all in heaven.