Welcome.

I think the first thing you do not try to do is meld into society, because you both cannot and also because when you are speaking of what is essentially the Dark Ages, people are very wary of strangers moving into their small little towns and villages.

So, if you are not joining a village, then you are trying, at first to lead an existence somewhat like a hermit. Are we many of us capable of this? Probably not, but what else do we have? If you walk into a village and say hello, they are likely to do you harm. If you are in the area of a small village, then perhaps after they become aware fo your existence, you can begin some social interaction. It's not going to happen quickly. The one thing that you'd be best doing is trying to learn how to implement and demonstrate some low level increases in the level of technology you can show those you do see.

Where you decide to try to lead such an existence, you'd be better off if you know something related to the language. You cannot speak their Old English, even reading Middle English requires a translation and then some struggle, but knowing modern English is closer to speaking that then trying to think you can learn ancient Hungarian.