Where are the Forms?

Arriving at knowledge through:

1. Perception

2. Developing in account (through the faculty of reason, see 185d and 186d)

3. Making a judgement

(notice how Kant claimed the same when reconciling empiricism with rationalism)

What is to say the above method is not the means to 'recollect' knowledge of the Forms?
I understand this method can be used to attain 'knowledge of convention' (mentioned by Matt), of which the forms are non-transcendental, but, again, what is to say this method cannot by applied to recollect the transcendent forms Plato mentions in his earlier dialogues, such as justice.

Does one begin to possess knowledge upon going through this method, and then 'has' or recollects it upon perceiving again (sensory or mentally) and recalling the judgement made, or does one possess knowledge prior to this method, and then recollects that knowledge when applying this method, and 'has' it everytime a perception is made (with the judgement)? (see198d)