Step 1: Stamp your image - I do this in a stamping platform. (Ensure you don't remove the stamp from the platform once you have done this and don't allow your stamped image to move throughout this whole process - if you want to re-stamp your image afterwards.)
Step 2: Line up 'step 1' of the stencil and apply your chosen colour of paint/s.
Step 3: Line up 'step 2' on the stencil with the toadstool roofs and apply your next choice of paint colour.
Step 4: Line up 'step 3' on the stencil with the doorframe, steps, window frames and underside of the toadstool roof and apply your choice of paint colour/s. Don't go across the whole door and windows - only apply the paint where you need it.
Step 5: Line up 'step 4' on the stencil with the door and apply your choice of paint colour/s.
Step 6: Line up 'step 5' on the stencil with the underside of the porch roof, door window, doorknob and Welcome plaque and apply your choice of paint colour/s. Don't go across the whole window as it makes it easier to line up the next step.
Step 7: Line up 'step 6' on the stencil with the windows and apply your choice of paint colour/s.
Step 8: Line up 'step 7' on the stencil with the spots on the toadstool roofs and apply your choice of paint colour/s.
Step 9: The house is now painted but most of the stamped detail has been lost.
Step 10: Re-ink the stamp to re-stamp the detail.
Step 11: Optional - Using the stamping platform you can add an extra window onto your house by stamping the matching individual window stamp and using 'steps 8 (above) & 9 (below)' on the stencil to colour it
Step 12: Re-stamp the window to regain the lost detail.
Step 13: The finished house with 'extra window'.
Hope this helps!
TIPS
Always work the paint well into your applicator first before applying the paint through the stencil.
My preferred applicators for this technique are several small domed stencil brushes.
When working through the steps of the stencil only apply the paint where it is needed for that particular step. For instance if you want a black frame around the door only apply the black paint to the frame area rather than across the whole door as this will enable you to still see the stamped image thus making it easier to line up the next step.
Don't be afraid to add light and shade when using the stencil by using more than one colour within the same area.
Add depth and interest afterwards to your stencilled image using pens, pencils, paint, ink etc.. to really bring your image to life.