Renting thru an agency is relatively painless. You tell them how many points you have, your home resort and when the points expire. They match you with a renter. You book the reservation in the renter's name, send the confirmation to the broker, and they send the confirmation number to the renter. You get paid a percentage of what you're due immediately and then get the balance after the renter checks in. The drawbacks are that some rental agencies have a force majeure clause in their rental agreement that places the owner responsible for any resort closures and requires a refund of all monies received by the owner. Rental agencies also pay the owners less than they can get by renting privately.
Doing the renting on your own can be time consuming. You will get a number of inquiries before you get a renter. Most non-owners don't understand the DVC system and it can take patience to guide them thru the process. Some potential renters will want to negotiate the price. If you are renting privately, you set the terms and conditions. Everything from price per point to payment terms, refunds, rescheduling and force majeure conditions are yours to define. And since every rental is a separate transaction, you can change the terms of each rental based on a variety of factors, such a offering to reschedule a trip once if the points have a while before expiration or a "no changes/no refunds" clause if the points are distressed.