Genealogists have never had the kind of access to records and other researches in the field as much as they do today. The internet has allowed people to do research from the comfort of their own computer at home, and that has allowed us to build family histories in record time.
One of the best resources you can access as a family researcher, is others with experience doing the same type of research you are--whether it be someone else doing research on your tree, someone researching a similar surname, or someone who has experience in a certain geographical area. I myself have learned so much by contacting others who have been doing similar searches in the field.
The best way I’ve found to find these individuals, is Facebook Groups. These are online group pages where just about anyone can join and post questions, information, images, and the like. I follow a few in particular and they are like being part of a mini-community. People have helped me with everything from translations to encouragement. If you don’t like the idea of being on Facebook--don’t worry. You don’t have to upload a picture, and you can join the site and just join the groups you’re interested.
To search for groups that might help you in your research, try searching for a city, town, village, or country name and the words "Genealogy, Genealogical, Family History" etc., to see if any groups meet your needs. If you're feeling ambitious, you can make one of your own!
Here are some groups that have helped me in my Saleker research in Prussia and Lithuania:
This group is mostly focused around the history and people of East Prussia (German Ostpreußen) There are many researchers on there from all over the world who have some kind of connection to East Prussia and Prussian-Lithuania
This group is focused on the larger area of what used to be Prussia (German Preußen.) Here, you can find information on East Prussia, West Prussia (German Westpreußen) and Pommern (Pomerania) which is modern day Poland.
This one is pretty self explanatory. There are many researchers here who also have German/Prussian roots.