Ah, you have found out that you must yourself estimate how hard a mission is. The game seems to have no checks in place as it can offer you missions that are totally impossible for you to do. Never take on a task that you are not pretty certain you are able to complete .
Help on how to do missions:
https://www.x3wiki.com/index.php/Missions Help speciffically on return ship missions:
https://www.x3wiki.com/index.php/Return_Ship A Teladi
Kestrel, or Pirate or advanced if you can aquire one, is very much recommended and so is a fast TM ship or other that has carrier capacity, also a jumpdrive & ECells, a transporter device to beam over JD + ECells and a docking computer. Damaged ships that have under 90% hull left will have their speed reduced relative to amount of damage; consider (not automatically correct choice) repairing it to 90%. Maybe also investing (cost
not reimbursed) in speed upgrades for the ship.
The
Egosoft forums is a wonderful source of lots of information too.
Under 'X Trilogy Universe' you find gameplay help for the X3 games. Just make sure they talk about the one you are playing and not Reunion or Albion Prelude (unless you switched to playing that).
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I spotted a mistake in the game installer: The installed play icons for the Terran War Pack are called 'X3:Albion Prelude' (correct) and 'X3 - Terran
War Pack' instead of 'X3:Terran
Conflict'.