Building brick oven is not hard to do, many people who never held a brick have built nice ovens for themselves. Basically; take it by building gradually, focus only on the one stage that you do. From the detailed photo sequence you will see ahead exactly what will be done, and how. Each stage/step on its own (e.g. the slab, inner walls, top slab, firebricks part etc.) is little job and easy. And stage by stage the structure grows nicely. Not much measuring goes around, only on the ground slab for the inner and outer-decorative walls, after that the oven is risen upwards and all is done on the initial brick count (you will see on the disk how I approach this. If stones are used for making the outer deco walls then the depth and width lines can be 2″ – 5cm further apart, on each side, because some rocks might be larger/wider than ordinary house bricks.) The photo sequence is detailed. To reach a stage e.g. what is on the picture 1430 in 3G MTo design, it can be done in 7 days but you do not need to do it in this timing. Work with cement blocks filled with concrete or with firebricks is faster, and there is waiting one and half day (or anywhere longer) for curing the ground and upper slab for the cement to cure. If you had a friend/s to help you, e.g. to lift the concrete blocks (these go into 4 rows, hip level) and to mix concrete, it’s only great, you can cook for them pizzas later.