It will be quite obvious. If it is not obvious then you are still too close to the target. You will need to move your telescope farther back from the target and start again. Ideally, the target should be exactly centered in this halo. If it is not, make the necessary adjustments to the secondary mirror to bring this about.
Tiny adjustments are all that is needed here.
Use your friend or your binoculars to check your adjustments. This procedure is very accurate and very tight collimation can be achieved if you are careful. At this point we must point out that the mechanical axis of your telescope comes in to play. Mechanical axis must be considered in order to achieve proper collimation. Without considering the mechanical axis of your telescope it is quite likely that you will put your telescope out of collimation.