First time nervous grower

As a new grower I was really unsure when to put them outside after they showed through the soil. I searched and searched and read conflicting advice, thanks to this website I think I have saved myself from ruining them completely by being able to ask questions to experienced growers :) Realised i should not have used the plastic cups as the roots need to be always in the dark, but as only been 3 days they should be fine now that i have transferred them...we will see! Out of the 5 germinated seeds, 3 were potted on the 28th and popped through soil on the 29th, 1 was potted on the 29th and popped through on the 30th, and one still hasn't popped through the soil and so it is still indoors in the dark. For the first 2 days that i could put them in the sun, I had read that they should be gradually exposed to the sun, for example 3 hours the first day, then adding an hour each day until after a week they can stay all day in the sun. Then i checked this info by asking questions on here as i really did not want to ruin them, and i am taking the advice of a grower with 35+ experience, which is that as soon as they show through the soil, they can go outside. So now (from day 3) from 9am-5pm they have the sun :) I am going to bring them all indoors tonight, last night was only about 15ºC and really quite windy. I have also asked for advice about this so see if anyone has had this experience that can hep me :)