The carpet slips under the pump up to the screws and under the heater core. I just install at least my 100th carpet and never had to trim the front. Also don't trim the side to much the door sill must hold it on top of the pinch weld.
The front carpet must overlap the rear it doesn't matter how much. Slip it front under the heater and washer pump as far as you can. I did not remove the pump or heater to install the carpets. The sill plates are the last thing I installed.
There may be more pictures in this thread. If not pm me for pictures of the carpet at the pump.
Finally paint
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