1. You would call it by: a. Calling it in a localscript by game.Players.LocalPlayer. b. From a normal script, if it was in the players hand, you would do game.Players:FindFirstChild(tool.Parent.Name) or if it was just in their backpack: tool.Parent.Parent

2. The tool would move with the animation, staying on the hand.

(Please accept if this helped you!)

Question One

From a localscript you can get the player by saying:

player = game.Players.LocalPlayer

Get the character by saying:

player = game.Players.LocalPlayer
repeat wait() until player.Character
character = player.Character

From a normal script it's a bit different. There is no concept of a local player because the script runs on the server not the client. The server only knows it has a bunch of players in it.

You can get a player, but only through roblox's built in events or through remote events.

Never tried getting a player through remote events. Don't think you'd ever need to.

If you want to get a player when you're touching a brick for example, you'd do the following:

part = game.Workspace.Part

part.Touched:Connect(function (hit)
       --see if the thing touching our part is a player
       local player = game.Players:FindFirstChild(hit.Parent.Name)

        --if it is a player get it's character and tool
        if(player)then
               local character = hit.Parent 
                local tool = character:FindFirstChildWhichIsA("Tool")
       end 
end)

Question Two:

Yes, you can even play both animations at once if you'd like.