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@Dammit
It’s a frame building task that should be performed before assembly- typically the frame is clamped in a vice at the bottom bracket, although some frame builders clamp the ream and then lower the frame onto it, using the frame for leverage.
Can the bottom bracket be removed and or is it stuck in place?
Reaming can be performed when the bike is assembled/painted, but clamping it in such a way that you don’t deform the tube you are reaming is key, and also using a proper, long team that won’t tip- if you go in at an angle you’ve fucked it and won’t be able to recover the situation.
Proceed with caution!