You may want to clarify geography a bit here. Western Europe was different from Central and they both were different from Eastern, for example.

You'll probably get better answers with a bit more specificity, but I can help a bit with western Europe.

England declined early, with Elizabeth granting abolition in 1574.

In France, the practice of feudal serfdom was officially abolished by the National Constituent Assembly in August 1789 when they struck down traditional aristocratic feudal rights.

In Germany, the process began in Schleswig in 1780 but continued into the German Confederation years on a state by state basis. Austria in particular dragged their feet until revolutionary legislature abolished serfdom in 1848.

In many of these areas, though, abolishing serfdom had little practical benefit. The peasants and workers were still tied to these lands pragmatically if not legally. They often owed rent/tithes to the their new landlords which was difficult to escape. In Prussia, for example, which liberated serfs in 1807, the serfs were expected to buy the land they worked from the landowner, which was quite impossible given their circumstances.

In general, the large trend is that abolition 'traveled' eastward throughout the 19th century. The French Revolution was a motivating factor for some states, as were the 1848 Revolutions. In actuality, though the practice as we conceive it (workers tied to land) had actually been on the decline for centuries throughout Europe. Peasant revolts, worker shortages from plagues and wars, and changing economies which brought new opportunities like travel to colonies, unskilled labor in cities, and, eventually the rise of the middle classes helped to eliminate the aristocracy's need for serfs.

As to the erosion of nobility, the French Revolution banned inherited privileges in 1790. The 19th Century experienced the rise of the middle class and capitalism helped to make wealth the ultimate social signifier. The collapse of entrenched nobility in Russia, Germany, and Austria after World War I was a death knell for major aristocratic privileges among most "major" European powers.

I've written this on mobile, so there may be a few typos and mistakes. Most of this information comes from basic sources, like Western Civ textbooks by Jackson Spielvogel, Lynn Hunt, and others. You can find helpful articles about Germany in 'The Oxford Short History of Germany,' which are article collections. Many books are available on the French Revolution and its aftermath. James Sperber's book 'The European Revolutions, 1848-51' has a particularly helpful background section that explains the eastward shift toward abolition as well as summaries of several smaller and/or more eastern states, but I don't have the book with me, or the expertise to recall specifics. In the case of France, 'Peasants into Frenchmen' by Eugene Weber is a classic on how abolition of serfdom still required extensive government intervention to eliminate the peasant class, even after World War I.