when you say improve your skills, do you mean you would like to develop as a plasterer and learn some new aspects of the trade or do you mean you have been doing it for a month and fancy trying to blag your way through a job? cos tbh mate thats what it sounds like.
welcome to the forum pal but in my experience you will have to get a bit more involved before people are fourth coming with the work. there are a lot of lads on here who are regulars that are looking for work so when it comes up people are inclined to give it to the people they are more familliar with