RE Spacers: There are bolt-on (min 15mm I believe) and slip-on, which is just a piece metal with holes in it. Hub centric means the hub hole is manufactured so it sits on your hub properly, instead of having a generic size (73mm or something).
The bolt-on spacers I've seen are hub centric (e.g. GKTech, meaning the hub hole is 66.1mm Nissan size).
Lipping/rolling isn't that hard, just get a heat gun to heat up paint and a roller (I bought an ebay one from Adelaide for $180-ish). Need patience and good smooth movements.