Preface:

I'm interested in learning 3 skills: Piano/Keyboard, Singing, Beatboxing.
I can devote around 2-3 hours daily. I want to "self-learn" (i.e. without tutor). I want to reach moderate level.
Moderate level is subjective, I know, but assume it's a level where, in terms of piano, you don't play your favorite tunes by one hand but also make use of chords too and be able to play themes like that of Time from Inception or Happy Potter theme song.

I planned to learn playing keyboard but as I was reading the introduction before going on to the chapter 1, I read "tutor is needed or otherwise you'll develop bad practices which would later cause you trouble". This was serious to me as I don't want that to happen.

So, I thought that it would be better to do something that I'm equally excited about but involves less "risk" doing it myself. I already planned to later learn singing and beatboxing but seems their turn might come first.

Question:

I want to compare the 3 (piano, singing, beatboxing) on the basis of the following:

1. Any gadget(s) needed to learn
2. Time to reach moderate expertise
3. Availability of free online resources
4. Tutor requirement/developing bad practices
5. Ease of evaluating myself (progress made so far)

It would be best if 1 is absent and 2, 4 are on lower side and 3, 5 are on higher side.

(I have hunch that beatboxing would be the best but not sure about the ranking of the other 2.)
I have a keyboard already.