The steps below are not exact the exact order but tips and suggestions but do feel free to use different ways and means if it is more appropriate to do so.
The building of the plane is tricky if it is your first time. Definitely not a novice job nor a 6 year can do. The plan does a poor job of showing the order of assembly or the way. I suggest taking the parts only when needed so that you would not need to search for pieces on the table. Taking the pieces out definitely needs some finesse; use a blade for delicate pieces (like #31 and 24). Glue is a must; and one that comes with the kit does a fine job. When using glue, do not start the other steps unless the white color of the glue turns transparent; ie dries.
The body (fuselage) construction should be the initial part of the building:
The inner piece (called #1) is flanked by left and right pieces (#8 L-R) and should be glued after gluing #2,3,4,5,6,7 (#3,4 &5 makes the pilot seat). Do use rubber bands to hold it in its place (3 should suffice). At this point you can also glue the lower tail fin (#18; don't break this piece into two).
You do not need to break apart the top piece of the body (#9) (you'll need to glue it back if you do) but do take the circle out from the middle since this will be the opening for pilot seat. Do glue the tail fin for your next step.
Once the glue dries, you can attach the top and bottom pieces of the body (#9 LR and 10). And apply the rubber bands again, till this section dries too. The top part of lower piece (#10) will not cover the bottom (because of the bottom is not straight) but that's OK. The wheel bars will go there later (#31 L-R).
You can assemble the propeller #26, 27, 28, 29x2, 30) meanwhile. Also you can assemble the engine compartment: Start with gluing one side of the #12, and #11 and #13 together. Then you can make the box with the rest of the pieces (#12,14,15). Do not attached these two pieces right away. Attaching the engine box to the body is better way to do it (#2 will face #11). Make sure the notches on #12 and #8 pieces align.
Attach (and glue) lower wing pieces (#23, and #24). Warning, the longer side should go to the front! This is not intuitive from the plan but the top wing (#25) will need to have an angled position when assembled (we leave that to the end for now).
I suggest leaving the assembly of the wheel parts in reverse order. Start with the wheels: 34, 33, 32 and 35 (in that order). Do leave a gap for #31L-R on the middle piece (#32). Attach the #31 L-R to the body and use glue generously. Attach the wheel kit (axle) while these pieces are not set. This will help you set up the angles right. Let is stay till it dries out.
You can glue machine guns #22 L-R (on top of #9 L-R) but make sure you leave some space for the outer part of the engine (#16, #17 - glue these together as well).
Gluing down the pieces 21 L-R is tricky. You need generous glue for the body side for these. Do not glue the top wing part. Using a rubber band, place the upper wing (#25) in its place and adjust the angle of these pieces so that it will touch the upper wing (#25). Once these connections dry out, you can assemble to upper wing.
Now all you should need to do is, glue down the tail wheel (#20), the propeller kit and the upper engine part (16-17).
This kit definitely takes time; especially when waiting for the glue to dry. This process was not my in my mind while getting this kit; nor I found it "easy" to assemble as it was written on the package. Not to mention, our 4-year old broke it within the first 15 minutes of play. Definitely not a kid's toy. However I feel more competent and feel like I can do a better job with a similar kit.