IF the wind and current are well established and the same direction, its fairly easy to visualize where you will end up. In a crowded anchorage, sometimes the best place to drop is just off the stern of the boat to weather of biggest 'hole' you can find. Deeper water means everyone will swing more and you need a bigger hole.
If no wind or tide, wind is against the tide, or the tide is turning, its much more difficult to see where things will end up. You will have to find a bigger 'hole', and you may have to re-anchor in a few hours if things don't work out--DON'T LEAVE YOUR BOAT UNTIL THINGS STABILIZE.
That's a good advice. I would like to point out the importance of the established wind and current. If there is little wind or a weak current the weight of the chain may be enough to hold the boat and eventually the boat can be very near to its own anchor. If you drop the anchor, on settled weather, assuming the other boat has the chain more or less tight, you can have a big surprise.
Don said also : "DON'T LEAVE YOUR BOAT UNTIL THINGS STABILIZE"
and that is very important. For not waiting, if the water is not too cold, I prefer to dive and have a look, just to be sure.
This is also a good advice: " sometimes the best place to drop is just off the stern of the boat to weather of biggest 'hole' you can find"
but if you are in a tight cove and have very weak, or no wind, it can happen that the current and wind funneled around drive the boats in different directions, with disastrous consequences (boats touching at the mid of the night, tangled chains).
One final advice: Let your anchor go with your boat going very slowly backwards (the wind is enough, if any) till you deploy your chain, then put your engine on idle backwards till the boat stop and then put more engine till your chain is completely tight. You are digging your anchor, checking the quality and hold of the bottom and checking where your boat sits with a fully tight chain.