Yes. You pick up and sort your cards at the start and keep them in hand, so you can look at them freely. Only the revealed and middle cards are on the table, and hands need not be face down.
Most likely yes. The rulebook is silent, but the community reading is that each player's hand size is public, as is where a claimed trio's cards came from.
Identical cards are interchangeable, so just show one from the matching end of your sorted hand: the leftmost for your lowest or the rightmost for your highest. Other players should be able to see which end it came from.
No. A card from your own hand may only be revealed if it is your lowest or highest. A matching card in the middle of your hand has to wait until the cards beside it are gone and it becomes an end card.
Yes. A trio can combine middle cards and other players' lowest or highest cards. Only the card coming from your own hand is limited to your lowest or highest.
Your turn ends immediately and every card you revealed goes back where it came from: face down in the middle, or returned to its owner. You can only reach a player's next card after revealing the one before it.
No. Your turn simply continues with one more reveal; if it does not match, the turn ends. A third card taken from a player must still be that player's lowest or highest.
You can only reveal them when each is your lowest or highest card, so cards sitting between them and the ends must go first. This applies to sevens too.
You win by collecting two trios whose numbers are connected, as shown in the bottom corners of the cards. Other trios do not end the game, so you keep playing until you hold two linked trios.
