Contemplating getting my armed sleeved(tattoo)?

okay so im contemplating on getting my arm sleeved as in getting my entire right arms covered in a big tattoo. my parents absolutly hate tattoos infact everyone in my family does besides me im 18 years old just graduated high school got a plan in the future(tattoos will not screw up my plans of becoming a welder) i got a full time job and my parents freak out when they hear the idea of me getting a little tattoo. i already have one its a spider web on my right elbow no i have not been to prison nor have i killed anyone nor am i a nazi it is due too substance abuse problem which assoiciates with me being caught in the web and they freaked out and said absolutly no more but i dont feel the need too have to listen im 18 years old graduated high school full time job and a plan for my future i dont get into trouble with the law anymore im straight and im just looking for some opinions i made the appointment for my tattoo today and its in 2 weeks and im either getting a little one or a sleeve someone just give me there opinions on getting the sleeve and what i should do thanks!