How do you know if you can hack being a missionary?

I asked a single female missionary of 10 years this. Her reply was perhaps all I need to know:

• You can't - but by God's strength.
• You can't - unless you want to and are called to. Then you should take the step and God will make it possible. It won't be easy, but it will be possible.
• You need to go with a missionary organisation that:
• understands what it's like to be a missionary
• has good financial support (the last thing you need is to be stressing about getting by)
• has good prayer support
• something else I can't remember
• in the first 3 years, supports you to do no more than learn language and culture and get a feel for possible ministry options
• You need another Western woman around who you have enough connection with to be able to pray together and offload onto. Someone to provide spiritual support (and of course, friendship will also be an offshoot of that).