You are posting in the 'Beginner' forum. I have no idea what your flying experience is. One thing I noticed in the description of the Cessna is: "It is designed for intermediate or advanced modeler."

If you search the ARF forum you'll see that many people really like NitroModels and that many others think they are terrible.

They do have a support forum on RCU:
http://www.rcuniverse.com/forum/forumid_456/tt.htm

A common theme seems to be: Do not bother trying to call or email them for customer service.

If you have issues or questions, go to their forum and send a PM (Private Message) to 'nitrostaff1' and you're likely to get the help you need.

If you do not have the experience of assembling multiple ARFs you may find the instructions are lacking a lot of details. Some of the instruction sheets are reportedly just poor copies of copies that are dark and blurry.

Read some their product descriptions:
Cessna: nitro gas powered
P47 Thunderbolt: like the legendary fighter jet from World War 2. (the P47 is NOT a jet)

If their instruction sheets are done by the same people who write the descriptions they could be confusing.