HIghly recommend you leave this to a trained gunmsith.
50-500 usd
Do not atttempt this. Find a gunsmith.
You will need to call Browning.
This is best left to a factory trained gunsmith.
100-1000 or more depending on EXACTLY what you have.
To disassemble a Browning Model 1886 lever action rifle for cleaning, first ensure the rifle is unloaded. Then, remove the barrel by loosening the magazine tube band and sliding the magazine tube forward. Next, remove the lever by pushing out the lever pivot pin and then taking out the bolt and carrier. Finally, clean all components thoroughly before reassembling the rifle in the reverse order.
There are many things to consider. Age, condition, scope... Say $3-600.
First, get a copy of the owner's manual. If it was made by Browning, go to Browning.com and request one. Second, follow the instructions.
If you are not trained to do this, I recommend you do not try it. Chances are better than even you will be taking a box of parts in to a gunsmith and that's not good.
Browning will send you an owner's manual for free if you request. Otherwise, ask a gunsmith for help
Download a manual from Browning or take it to a gunsmith
The browning web site will provide this info.