Just to add that these ^ adjustments rarely are done in one day. Small adjustments will make substantial changes in your comfort and performance on the bike. If you have access to a bike trainer (that you can borrow for a few weeks) that'd be a good way to make an adjustment and compare your riding result.
Make measurements and keep detailed notes. Read and re-read what your observations are as you make adjustments. Subjective is one aspect, yes. Random is what you want to avoid.