Google has already written (or generated) a lot of API in Objective-C, which can be found in the link above. In these APIs, almost all parts network affairs are implemented for you, and you can just apply something like username or list name for your situation, and call a simple method to finish your job. That means you can get rid of the painful post/get/delete and write the request by your self. You can check these OC APIs of Youtube in detail by this link.
Maybe you can check about this Objective-C API set provided by Google. Write all the REST things could be painful.
Or if you want to implement the request by yourself, you can try some network frameworks, such as AFNetworking or MKNetworkKit. I guess you will not want to use the Apple's network SDK, which is really hard to use.
What i think onevcat is trying to say is to use a wrapper to construct your calls. Building the request, adding all headers, etc could be costly as time and code. You'd better check out the library Google provides in this regard. code.google.com/p/gdata-objectivec-client Edit: looks like onevcat explained himself already :)
Yes, you're right. For some special reasons, my team is implement request by ourself. The framework We are using is: ASIHTTPRequest