Don't send all your coins there straight away if you have never used a multisig address before. First send a few cents worth of coins, then try to move them back out again. If you make a mistake you will only lose a few cents rather than all your Bitcoins. Only send a big amount of coins after you get used to using multisig.
This. Practical testing costs you almost nothing (apart from your time) and often is worth more than dozens of forum advises. Same goes not only for multisig addresses, but for pretty much everything (new wallets, creating/redeeming paper wallets, recovering from back up files etc).