Piano is by far the most finger dependent of all instruments. It doesn't matter how well you think you know a piece, play it slowly at least one time for two times you play it fast. When you play scales as part of your regular routine, you'll learn which notes are sharp or flat within each key, and your hands will become more familiar with the piano at the same time.
The starting point to becoming a musician is to take the time and learn your first few initial chords. While sitting down and practicing the same piece of music until you play it perfectly is a good way to practice, switch it up every once in awhile by throwing a random piece into the mix.
You can't look at your hands and keys as well as the score while you are playing the piano. That said, there is a reason learning musical notation is considered foundational in traditional music classes. They're usually just 3-note chords, and require only one note change from your average major or minor chord.
Depending on what music you're learning, you may be able to find instrumental accompaniment tracks that go with your music. 17) Scales must be played more times correctly than incorrectly otherwise all you're doing is ‘negative practising'. When you start missing notes in a section, you don't need to practice it over and over at full speed; you need to slow down.
I don't want to create expectations, but I find suspended chords fairly simple to learn and play. If your hands or arms start to hurt or feel tired, stop immediately. If you notice that the piece is dominated by high notes, shift the bench to the right. For those of you who know nothing about classical music, here are a few classical composers whose pieces would be great to learn: Bach, Chopin, or really any classical Etudes (for the very daring).
In a perfect world my students would always play with rhythmic accuracy, but I have found that it is better to hesitate and get the correct notes and fingerings than to forge ahead and play the Pasek and Paul right rhythm but the wrong notes. Too often, students will get caught in the rut of only playing songs they know they can play.
There is no right or wrong way to go about playing the piano. Learning to play a song on the piano can be frustrating. It looks as if you've learned keyboard in a 'block chord in the LH, melody in the RH' style. If you're struggling to motivate yourself to learn a piece, enter a competition or invite friends over to listen to you play on a certain date.