One more thing- since you are a windowsill grower and your plants will probably be getting some direct morning sun- you may want to slip the clear pots into an opaque one (with drain holes) or wrap tinfoil around the pots. Direct sun on clear pots can heat the root zone even more than in black pots. It's the greenhouse effect. I would just wrap your hand around the pot when you notice they are getting sun. If the pot feels warm (remember that our skin temperature is about 90 degrees) then it is too hot. Also if leaves ever feel warm, they are getting too warm. However- if you have a shaded south window and the light is diffused, you probably don't have to worry. Anyway, I wish I had a robust growing cattleya to send you. I think it would be most encouraging for you to start with a super healthy plant that had previously bloomed, but the sad fact is that I was in poor health the last two years and unable to properly care for my collection. In those two years, I probably only watered 15 times. I lost a lot of orchids and the ones I have now are set back but I do have a few that are giving me flowers again and I have been giving them great care since about May. I figured out a way to water my plants in place on my shelves without having to carry them to the sink, so it will even be easy to care for them if I go downhill again. ANYWAY, that should tell you how tough they are and give you some hope and I'm sure yours will bounce back quickly if you keep a close eye on them and give them what they need. I'm glad most are in clear pots so you can watch the roots grow. I always get excited about roots and clear pots make it so much easier to see what's going on. Anyway, try not to stress too much. These plants are tough as nails. The thing I've found most helpful is to keep a sheet of paper for each orchid, write down any disease symptoms (in detail) as well as when they start a new growth, when they start rooting etc. keep track of any fungicide applications, etc. etc. i find that doing this helps me "know" my plants better because I am paying attention. I made a little grid with the months at the top and then " shooting, rooting, blooming, repot" down the side. I keep one on each page and every month I will go through and make a little x in whatever box. Then I can also write any other notes about what the plant is doing. I also keep a record of the minimum and maximum temperatures so if I can't get something to bloom, I can look back and see what conditions it was in and then change them if I need to. Anyway, that is something I do and it's fun. You don't have to do it and probably most people don't, but once I started keeping records, it made me pay attention more and I became more observant and I started learning faster. Ugh- sorry my posts are so long. I just want you to be able to enjoy your plants and have good success. Also most importantly is to know what your conditions are and choose plants that will grow well in those conditions. I've successfully grown and bloomed cattleyas in an upstairs window in regular house temperatures and I think sometimes they don't really need to get as cold as a lot of books say they do. Ok- promise I'm really shutting up now. Hehe.