Differences between 濃茶 and 薄茶 are pronounced: In the former, you cannot move the 釜 lid with the 柄杓 in hand, with the latter you can. With the former, 拝見 begins when 建水 is back; in the latter, host comes in with 建水 for the conversation.
In the old times, it was preferable to have a 皆具 with all different metals.
When picking up 火箸, turn them so your palm faces up. R, L up, then R bottom to turn. Keep tips together until you reach the 杓立て.