The best time to pour into your mold is as soon as you can after your soap has reached true trace. Now you don't want to wait too long either, like past the custard looking stage, as you may end up with hardened soap in the pan. After you use the stick blender, you want to go back to hand stirring with the spoon so as to get the little bubbles out that the stick blender created. If you don't hand stir after using the stick blender, these little bubbles can become trapped as the soap begins to thicken. These little bubbles will be noticeable in your finished soap.
Stick blenders are a blessing and do save a lot of time if used just for a minute or two.
Some fragrance oils may cause your soap to thicken up quickly, so you want to be ready to get this mix poured in the mold as soon as you can after you've blended your fragrance in well. Don't use any fragrance that might contain alcohol, as this can ruin your soap, causing it to curdle. Wrap your mold completely with the blanket to insulate. Don't be in a hurry by peeking at it, because when you open up the blanket, you are letting precious heat out that is needed for proper saponification. You can feel the blanket on the outside and it will get warmer and stay warm while it is undergoing its metamorphosis.