Before granting a trial, consider whether the task could be controversial (e.g. most bots making non-maintenance edits to articles and most bots posting messages on user talk pages). If so, and the request does not already link to a discussion showing consensus in an appropriate forum (or silence after a reasonable waiting period), use {{BOTREQ|advertise}} to request that that be done.
When you are satisfied that enough time has passed for discussion and (if relevant) that any technical issues have been resolved, use {{BotTrial}} to approve a trial run.
AnomieBOT should then move the request from the 'open' section to the trial section, and also change the last parameter of {{BRFA}} from 'Open' to 'Trial'.
Approving/denying a request
When you feel enough time has passed after the trial for discussion/analysis/improvements, and are ready to approve/deny the request (the procedure is the same for expired/withdrawn requests), add {{subst:BT|STATUS|BOT_NAME_AND_TASK_NUMBER}} (where STATUS is Approved, Speedy, Denied, Withdrawn or Expired) to the top of the request page, replacing Category:Wikipedia bot requests for approval and the code surrounding it.
Make any final comments along with a relevant status template (listed here), and add {{subst:BB}} to the bottom of the page.
Archival
AnomieBOT will typically take care of the below; these instructions are retained for posterity and in case of any interruption in bot service. As a best practice, watchlist the relevant pages and keep an eye to ensure the bot does the needful.
After closing the BRFA, you'll need to remove the BRFA template from whichever section it is in on the main requests page (tip: copy the template to the clipboard for use in the next step) and then archive it in the appropriate section:
For approved requests where a bot flag is required: Click here, and add {{BRFA|BOT_NAME|TASK_NUMBER (if needed)|Approved|~~~~~}} to the top of the list.
For approved requests where the bot is already flagged: Click the above link and add {{subst:BRFAA|BOT_NAME|TASK_NUMBER (if needed)|Flagged|~~~~~}}.
For approved requests where the bot is going to run unflagged: Click the above link and add {{subst:BRFAA|BOT_NAME|TASK_NUMBER (if needed)|Unflagged|~~~~~}}.
For denied requests: Click here and add {{BRFA|BOT_NAME|TASK_NUMBER (if needed)|Denied|~~~~~}} to the top of the list.
For expired/withdrawn requests: Click here and add {{BRFA|BOT_NAME|TASK_NUMBER (if needed)|Withdrawn/Expired|~~~~~}} to the top of the list.