Clarify talos:bootstrap setup instructions (#1438)

README.md

@@ -279,6 +279,8 @@ You have two different options for setting up your local workstation.
     task talos:bootstrap
     ```
 
+2. ⚠️ It might take a while for the cluster to be setup (10+ minutes is normal), during which time you will see a variety of error messages like: "couldn't get current server API group list," "error: no matching resources found", etc. This is a normal. If this step gets interrupted, e.g. by pressing <kbd>Ctrl</kbd> + <kbd>C</kbd>, you likely will need to [nuke the cluster](#-Nuke) before trying again.
+
 #### k3s
 
 1. Install Kubernetes depending on the distribution you chose