cj, Take your time with it. You are off to a great start, doing the collimation in the daytime when you can 'see' what is happening.
fwiw, lay the tube flat on a lounge or bed, pointing towards an open door or window. Align the focuser/2ndary first, as per the links, then continue on till you reckon it's O.K. Take outside & tweak via a star test.
Don't worry about trying to get over 200 X mag. You'll only get to use that mag & above, when the conditions are good to excellent.
Most of our viewing is done in the range 35 to 150 X ??? (weather permitting).
HTH.
L.