This is a different question born from the discussion [How do I know if a pending transaction will be successful?](https://iota.stackexchange.com/questions/174/how-do-i-know-if-a-pending-transaction-will-be-successful/).

I'd like to know **WHEN** I have the green light to try to do a second transaction in case the first one is still in pending.

Please explain the differences (if any) from using the Light Wallet (computer) or the Android Wallet (smartphone).