Any tips for me to handle my TheMightyHobie18 alone? As someones has noticed I'm a new user on the site. Thank you for all who has answered my previous questions...

Anyhow, my thing is that I have an older Hobie 18 Magnum located in family summer cottage outside Helsinki (Finland). It was bought to us by my father about 10 years ago. I rented it for a friend of mine few year ago and now I got it back and I have some plans to start to sail with it. I don't have much crew options since I don't have a boatplace in "public areas". Anyhow few are around. My girlfriend a sporty scubadiver, no sailing background, my mother used to sail with cats back in 70's, my sister who almost born in a boat but she's not so in to it now a days and her boyfriend who is more into anything which goes with engine. So I have this beautiful cat and I don't have the money to buy a smaller one (there ain't so much cat sailors in finland so used ones are rare, new ones costs too much)and my crew like to sail, but they don't have the same burning feeling like I do. So all the tips for sailing a bigger cat alone are more than wellcome. By the way, like i early mentioned, I have sailed multihulls for a long time but not so much with "beach cats" and I weight about 80 kg.