As I remember and it's a long while since I did this Tutorial, not far from the start around the first bend along the road there is a small rise, you'll have to look hard to see it. Bring both tanks together and stop them just prior to the rise only a few meters away, there hopefully they will get a hull down position. By bringing them to this location together you should have an advantage over the German tanks and be able to deal with them separately with a 2 to 1 advantage. I'm pretty sure that's how I overcame them after similar experiences to yourself when starting out with this great game and this Tutorial.
You might have to try this a couple of times but it's worth it to get it right
Good luck and keep us posted if it works.
Cheers,
Gordon