Take it out for a reeeal good test drive , tell them see ya in 1/2 hour , come back in one hour . When I bought a new Olds in '97 , I did this , but kept the car at my house , overnight ,yeah I called the dealer , told them I AM Gonna buy it , " can I see you tomorrow and pay ?? " They say , yay !
Before your thorough test - Learn all you can about any vulnerable / peculiarities to note while you enjoy that test ride.
Sounds like you really want to go for it. My BMW car , V8 , is an exceptional machine , don't care a bit IF not too reliable , driving it beats all .
" Uncle Jed I is an electrician and au-to mechanic , don't give a Schitt "