The kitchen counter-top ovens that have a strong forced-air fan inside the oven chamber are the best to use as a reflow oven. The UltraVection oven, manufactured many years ago, is one such oven (look on YouTube.) I converted one and used it successfully without a controller. It was not easy to use because I had to experiment to get the pre-heat timing just right, but it did OK for a few dozen boards and the price was right at $10, used.
To give yourself the best chance at success, you need to use a good, robust solder paste. I would recommend no other than Kester Easy Profile 256
(EP-256) for a no-clean lead-bearing paste, or Kester NXG1
no-clean lead-free solder paste. They are the best-of-class for printing and reflow. They're damn good.
Also, don't think you can buy a small syringe of solder paste off eBay and have it usable for stenciling. Solder paste needs to be refrigerated and once it's repackaged out of it's original factory jar or cartridge, it looses it's stenciling properties fairly quickly, maybe 2 - 3 weeks. Buy a 1000 g. jar, not the cartridge. You need to stir the whole jar for a few minutes just before you use it then "condition" the paste with your metal squeegee.
A top-quality desktop "batch" reflow oven will set you back $5000 US and even those kind of suck on temperature control. I've used them and was not impressed, to say the least.