How to use a sniper?
Please note that the use of snipers is not officially encouraged. After all, in order to make a bet, a sniper must have access to your account (get a login/password). And this can be attributed to the transfer of the account to third parties, which is prohibited. But in fact, this is not particularly watched, and therefore the use of third-party automated programs on eBay is very common.
Moreover, they are often used by unscrupulous sellers who do not want to sell their goods at a low price, but are forced to create the appearance of trading. At the last minute, they interrupt the bid, which seems too low to them, and then allegedly buy a lot. Or, conversely, they twist the bids to the maximum in order to then abandon their, the highest bid, and make the buyer, who took second place at the auction, make a purchase. Intentionally increasing the value of your lot at the auction by interrupting the bids of ordinary buyers is also not allowed by eBay rules. But this stops few people.
Regardless of the type of service, setting the parameters does not take much time. To start the "sniper", you need to select the lot number (it is listed on the product page and in the address bar), specify your maximum bet and the time when the shot will be fired. Everything, you can give a command to trigger, and at the right time in the auction will be made instantaneous bet, which is unlikely to have time to interrupt manually.
Please note that the best way to use the proven services is not to "shoot" yourself with additional problems. Look for feedback on the selected service, find out its pros and cons. It is important that the "sniper" was not new, but had at least a year of successful work. Then you can safely use it.