Accessing server with PSI CONFUSION/CLARIFICATION

Hi,

We use Microsoft Project 2010 to manage project related tasks. I created a web page to access the project list with use of web service(project app url which is working).

Not tried WCF route since I dont have the project server GUID. Have couple of queries on this

1. Can I get Project server GUID from remote machine?

2. Do we need to be in Admin role to access WCF/OData services?

I am also trying other option to call the web service via Ajax/Jquery(Not sure if that work/ feasible). I created request and fired the project server WSDL web service url and what I got response was WSDL xml document. I tried passing user credentials to the $.ajax request but that too failing/returned only WSDL document. sample below. 

var soapRequest = '<?xml version="1.0" encoding="utf-8"?> \
                                <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" \
                                    xmlns:xsd="http://www.w3.org/2001/XMLSchema" \
                                    xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> \
                                  <soap:Body> \
                                    <ReadProjectList />  \
                                  </soap:Body> \
                                </soap:Envelope>';

            $.ajax({
                type: 'POST',
                datatype: 'xml',
                processData: false,
                url: 'https://<project_server>/<project>/_vti_bin/PSI/Project.asmx?wsdl',
                username: username,  // Most SAP web services require credentials
                password: password,
                data: soapRequest,
                crossDomain: true,
                xhrFields: {
                    withCredentials: true
                },
                success: processSuccess,
                error: processError
            });

Is it possible to use a simple HTML page and use jquery/ajax to call project services? if for any security reasons, it is not achievable, can I create a dummy ASP.Net web page/project (just to run as localhost) and call this HTML from URL? Will that work?

The last question

Can I get the microsoft project GUID(outline level zero) manually from microsoft project desktop application? What we see inside the application are sublevel tasks(1 and above)?

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--- Thanks & Regards, Guhan