How to get from gili t to Nusa Penida

I am planning on leaving gili t tomorrow and head to Nusa Penida. We have heard from a few people that the best thing to do it get a boat and bus to Sanur, then a public boat over to Nusa Penida from there. Has anybody took this route and have any other information about it? You can buy the tickets to Sanur here for 250,000.