Here are the flowers I made on Wednesday using the tutorial from folding trees. I have one piece of advice to make the assembly easier. It's a piece of advice I often give regarding paper projects: use Zots. Those little sticky dots have saved my sanity so many times.
When I made each individual petal, I used glue, as suggested. Then, to get the petals to stick together, Zots worked brilliantly. I'm very impatient about holding paper together while waiting for glue to dry. At $4.30 for a box of 300 Zots and lots of time saved, it's a worthwhile investment if you ever need a good adhesive.