you mention your lack of work experience this is where you will get an unsatisfactory skills assessment.. Did you complete an apprenticeship ?, get yourself a WHV before it's too late as I'd say you don't meet the criteria for a 189 just yet. Getting a positive skills assessment can be tricky even for guys who have been in the trade for years as they want to know everything and see documents. I was asked to show 2 years minimum post apprenticeship so 6 years before they would look at me.. Possibly talk to a registered agent