I would probably take spices with me annd pretend that I am a trader from far away. It would make me rich immediately and people wouldn't kill me because I am a foreigner, due to the fact that traders were guarded by the crown. Plus spices are light and I could carry a lot of them.
New technology probably would lead to decapitation.
Foreigners generally had no rights that time around, so it would be quite tough to survive.