Hey Simon,
Using your phone for any sort of alignment will give you extremely poor alignment, and that's at best! The 3 star method will account for errors and slewing accuracy can still be fairly good even if you are polar aligned poorly. I know this because I used to try to image without any knowledge on proper polar alignment and wonder what was going on! Use your phone or a compass to point it roughly south but thats about as far as it will help. And the NEQ6 can handle loads quite comfortably over 10kgs, so your 200mm lens will be just fine.
Most important, above all else, is to understand what polar alignment is, why it is needed, and why does moving your scope in this direction or adjusting it in that direction make it better or worse. Once you get the theory down pat, polar alignment is extremely easy
Have a look on youtube and google polar alignment, I personally found the best way is to use the CCD drift method if you doing astrophotography. If you google this you will find plenty of instructions. I can get to a few minutes unguided at 200mm using the method and doesnt take more than 15 minutes to get there. Handy tip - your altitude angle of the mount is equal to your latitude (so for melbournians thats about 37 degrees) and once set never needs to be adjusted again, unless you drive north or south for a few hundred kms! Your azimuth (left-right) however does change every night simply because you can never point your mount in exactly the same direction again and again. I also used to set up every night and not leave it out so once I got my mount aligned really well, I marked the position of the legs on the ground and glued washers . Then every night I could just move the mount out, let the legs fall inside the washer and bang all done!