ebay questions

[GorillaMaxx360]

I am becoming a more frequent seller on ebay and have never yet bought anything I have only sold items. It is time for me to buy something and I just had a few questions regarding the purchasing of an item.

1.) Is it relatively idiot proof when paying someone using paypal once you won a bid or are there some specific steps I need to note.
2.) Are there any charges/extra fees I need to pay when buying the item except for the final cost and the shipping. For example if the item is $150USD and shipping is free, is it safe to deposit 150 into the paypal account, or do i need to add sightly more money to paypal account for miscellaneous fees.
3.) Are there any other things i should know when buying. it looks pretty simple but i just wanted to make sure i am on the right track.

Thanks