There’s a great thread that details how you can get some better weather information out of the sim before you take on a mission:
You can use that to avoid flying into places where you can’t perform a visual approach.
However, if you need help getting into a field without a published approach, try loading the vectors to final into your G1000. The destination should be programmed in already from the mission’s flight plan, and then you can just hit the approach button. You can get lined up with a glide path to follow or put into the autopilot.