You can only don armor you’re proficient with, and to take action you will need to commit an hour or so in contact with it, incorporating the armor into your system. To doff it you will need to also devote an hour, you could rest although donning or doffing your armor like this. Beast 

When you have a good fighting chance to conquer your enemies, you may test your most difficult to take action. Nonetheless, that does not necessarily mean you will struggle suicidal battles just for the hell. An clever warrior is aware of when to quit.  On the subject of armor, the Warforged

Breathing life into clay, wiping total planets from existence, and manipulating the really cloth of actuality in a whim, the deities from the multiverse are palpable forces that push truth, so you, my most devout Prepared, would be the instrument in their designs. Half-constructed Loss of life ra