Keep practicing the same 30 again until you have it down, just to make sure you get them down before moving on to the next 30. If I were you I'd only move on when your confident with them or else working with them will be for nothing because you'll be caught up learning new things that you'll forget the first 30. Also, if you feel like 30 is too overwhelming then lower your number's to 20. You only need to learn about 2000 even if there's around 50,000.
Think about it this way: If you see a board with that kanji wherever you go in Japan, will you be able to recognize and tell what it is? If so, then move on. If not, then keep working on it.
At the end of the week or so of kanji I would recommend testing yourself to see if everything has sticked before moving on to more.