Not sure my advice on renting versus buying would be helpful. You first question though is one I've been sruggling with for many years: is working for others and striving for self-sufficient or self-sufficientish goals contradictory?
/Startup rambling and overly long response/
I would love to be completely sell-sufficient, but this seems more of an ideal or fantasy rather than a practical goal. Self sufficiency contradictions pop up everywhere. For example: I'm posting this from a computer that I could never manufacture myself. The computer is using power, that with enough investment in solar panels or wind turbines, I could generate myself; but then, those solar panels and wind turbines are also beyond my ability to build from scratch. Heck, even something as simple as the garden fork I used this morning to turn my compost is beyond my ability to manufacture.
If I need or want these things, then no matter how much I would like it to be otherwise, I'm dependent on others. Even if I were to decide no more computers, no more Internet, no more whatever, there will still be something I can only get by dealing with other people. Lessening wants can certainly lessen the amount of time devoted to work for others. The best I've been able to do is to try and figure out what's a need and what's a want.
I'm terrible at this. I mistake wants and needs all the time. Then I spend more painful time trying to get rid of things I acquired that were certainly unneeded and are now unwanted. I guess the important thing is that whether getting something or getting rd of it, I'm doing it in the context of a community. Exchanging money earned from work for items produced by others doesn't mean there's not a community. I bought the computer from an old friend who owns a small computer store. I bought the garden fork from a neighbor who was moving. This same neighbor bought my unused (and unmissed!) roto-tiller.
So, what does this have to do with the basic contradiction of working for others and self sufficiency? Like us all, I work to live. I trade some of my time, skills and knowledge for a paycheck. (Both my employer and I probably think the other got the best side of the bargain.

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With my paycheck I bought the computer I'm typing on as well as the garden fork I used to turn my compost. I can't completely escape work. I can't be Robinson Crusoe. (Of course old Robinson had a ship load of ready-made tools and supplies at hand.) What I can do is figure out how to integrate work and non-work life (including my self sufficientish goals).
Trying to isolate work life and home life, to split them apart into two isolated and insulated islands, is good way to go crazy with frustration. For me, the only way to stay sane and happy is to find ways to make work life and non-work life parts of a bigger community. Staying happy and sane (or sanish) seem to be the essence of the good life.
/Stop rambling and overly long response/
